500 (number)

Mathematical properties

500 = 22 × 53. It is an Achilles number and a Harshad number, meaning it is divisible by the sum of its digits. It is the number of planar partitions of 10.

Other fields

Five hundred is also

• the number that many NASCAR races often use at the end of their race names (e.g., Daytona 500), to denote the length of the race (in miles, kilometers or laps).
• the longest advertised distance (in miles) of the IndyCar Series and its premier race, the Indianapolis 500.

Slang names

• Monkey (UK slang for £500; US slang for $500)

Integers from 501 to 599

500s

501

Main article: 501 (number)

501 = 3 × 167. It is:

• the sum of the first 18 primes (a term of the sequence ).
• palindromic in bases 9 (6169) and 20 (15120).

502

• 502 = 2 × 251
• vertically symmetric number

503

503 is:

• a prime number.
• a safe prime.
• the sum of three consecutive primes (163 + 167 + 173).
• the sum of the cubes of the first four primes.
• a Chen prime
• an Eisenstein prime with no imaginary part.
• an index of a prime Lucas number.
• an isolated prime

504

504 = 23 × 32 × 7. It is:

• the sum between the smallest pair of amicable numbers (220, 284).
• a tribonacci number.
• a semi-meandric number.
• a refactorable number.
• a Harshad number. :\sum_{n=0}^{10}{504}^{n} is prime
• the group order of the fourth smallest non-cyclic simple group A1(8) = 2G2(3)′.
• the number of symmetries of the simple group PSL(2,8) that is the automorphism group of the Macbeath surface.
• a largely composite number

505

• 505 = 5 × 101
• model number of Levi's jeans, model number of
• This number is the magic constant of n×n normal magic square and n-queens problem for n = 10.

506

506 = 2 × 11 × 23. It is:

• a sphenic number.
• a square pyramidal number.
• a pronic number.
• a Harshad number. 10^{506}-10^{253}-1 is a prime number. Its decimal expansion is 252 nines, an eight, and 253 more nines.

507

• 507 = 3 × 132 = 232 - 23 + 1, which makes it a central polygonal number
  • The age Ming had before dying.

508

• 508 = 22 × 127, sum of four consecutive primes (113 + 127 + 131 + 137), number of graphical forest partitions of 30, since 508 = 222 + 22 + 2 it is the maximum number of regions into which 23 intersecting circles divide the plane.

509

509 is:

• a prime number.
• a Sophie Germain prime, smallest Sophie Germain prime to start a 4-term Cunningham chain of the first kind {509, 1019, 2039, 4079}.
• a Chen prime.
• an Eisenstein prime with no imaginary part.
• a highly cototient number
• a prime index prime.

510s

510

510 = 2 × 3 × 5 × 17. It is:

• the sum of eight consecutive primes (47 + 53 + 59 + 61 + 67 + 71 + 73 + 79).
• the sum of ten consecutive primes (31 + 37 + 41 + 43 + 47 + 53 + 59 + 61 + 67 + 71).
• the sum of twelve consecutive primes (19 + 23 + 29 + 31 + 37 + 41 + 43 + 47 + 53 + 59 + 61 + 67).
• a nontotient.
• a sparsely totient number.
• a Harshad number.
• the number of nonempty proper subsets of an 9-element set.

511

Main article: 511 (number)

511 = 7 × 73. It is:

• a Harshad number.
• a palindromic number and a repdigit in bases 2 (1111111112) and 8 (7778)
• 5-1-1, a roadway status and transit information hotline in many metropolitan areas of the United States.

512

Main article: 512 (number)

512 = 83 = 29. It is:

• a power of two
• a cube of 8
• a Leyland number using 4 & 4 (44 + 44)
• a Dudeney number.
• a Harshad number
• palindromic in bases 7 (13317) and 15 (24215)
• a vertically symmetric number

513

513 = 33 × 19. It is:

• Leyland number of the second kind using 3 & 6 (36 - 63)
• palindromic in bases 2 (10000000012) and 8 (10018)
• a Harshad number
• Area code of Cincinnati, Ohio

514

514 = 2 × 257, it is:

• a centered triangular number.
• a nontotient
• a palindrome in bases 4 (200024), 16 (20216), and 19 (18119)
• an Area Code for Montreal, Canada

515

515 = 5 × 103, it is:

• the sum of nine consecutive primes (41 + 43 + 47 + 53 + 59 + 61 + 67 + 71 + 73).
• the number of complete compositions of 11.

516

516 = 22 × 3 × 43, it is:

• nontotient.
• untouchable number.
• refactorable number.
• a Harshad number.

517

517 = 11 × 47, it is:

• the sum of five consecutive primes (97 + 101 + 103 + 107 + 109).
• a Smith number.

518

518 = 2 × 7 × 37, it is:

• = 51 + 12 + 83 (a property shared with 175 and 598).
• a sphenic number.
• a nontotient.
• an untouchable number.
• palindromic and a repdigit in bases 6 (22226) and 36 (EE36).
• a Harshad number.

519

519 = 3 × 173, it is:

• the sum of three consecutive primes (167 + 173 + 179)
• palindromic in bases 9 (6369) and 12 (37312)
• a D-number.

520s

520

520 = 23 × 5 × 13. It is:

• an untouchable number.
• an idoneal number
• a palindromic number in base 14 (29214).

521

521 is:

• a Lucas prime.
• A Mersenne exponent, i.e. 2521−1 is prime.
  • The largest known such exponent that is the lesser of twin primes
• a Chen prime.
• an Eisenstein prime with no imaginary part.
• palindromic in bases 11 (43411) and 20 (16120). 4521 - 3521 is prime

522

522 = 2 × 32 × 29. It is:

• the sum of six consecutive primes (73 + 79 + 83 + 89 + 97 + 101).
• a repdigit in bases 28 (II28) and 57 (9957).
• a Harshad number.
• number of series-parallel networks with 8 unlabeled edges.

523

523 is:

• a prime number.
• the sum of seven consecutive primes (61 + 67 + 71 + 73 + 79 + 83 + 89).
• palindromic in bases 13 (31313) and 18 (1B118).
• a prime with a prime number of prime digits
• the smallest prime number that starts a prime gap of length greater than 14

524

524 = 22 × 131

• number of partitions of 44 into powers of 2

525

525 = 3 × 52 × 7. It is palindromic in base ten, as well as the fifty-fifth self number greater than 1 in decimal. It is also:

• the sum of all prime numbers that divide the orders of the twenty-six sporadic groups (2, 3, 5, ..., 71; aside from 53 and 61).
• the sum of the dimensions of all five exceptional Lie algebras (14, 52, 78, 133, 248). 525 is the number of scan lines in the NTSC television standard.

526

526 = 2 × 263, centered pentagonal number, nontotient, Smith number

527

527 = 17 × 31. It is:

• palindromic in base 15 (25215)
• number of diagonals in a 34-gon
• also, the section of the US Tax Code regulating soft money political campaigning (see 527 groups)

528

528 = 24 × 3 × 11. It is:

• the 32nd triangular number.
• palindromic in bases 9 (6469) and 17 (1E117).
• the 167th Totient number.

529

529 = 232. It is:

• a centered octagonal number.
• a lazy caterer number .
• also Section 529 of the IRS tax code organizes 529 plans to encourage saving for higher education.

530s

530

530 = 2 × 5 × 53. It is:

• a sphenic number.
• a nontotient.
• the sum of totient function for first 41 integers.
• an untouchable number.
• the sum of the first three perfect numbers.
• palindromic in bases 4 (201024), 16 (21216), and 23 (10123).
• a US telephone area code that covers much of Northern California.

531

531 = 32 × 59. It is:

• palindromic in base 12 (38312).
• a Harshad number.
• number of symmetric matrices with nonnegative integer entries and without zero rows or columns such that sum of all entries is equal to 6

532

532 = 22 × 7 × 19. It is:

• a pentagonal number.
• a nontotient.
• palindromic and a repdigit in bases 11 (44411), 27 (JJ27), and 37 (EE37).
• admirable number.

533

533 = 13 × 41. It is:

• the sum of three consecutive primes (173 + 179 + 181).
• the sum of five consecutive primes (101 + 103 + 107 + 109 + 113).
• palindromic in base 19 (19119).
• generalized octagonal number.

534

534 = 2 × 3 × 89. It is:

• a sphenic number.
• the sum of four consecutive primes (127 + 131 + 137 + 139).
• a nontotient.
• palindromic in bases 5 (41145) and 14 (2A214).
• an admirable number.

:\sum_{n=0}^{10}{534}^{n} is prime

535

535 = 5 × 107. It is:

• a Smith number.

34 n^3 + 51 n^2 + 27 n+ 5 for n = 2; this polynomial plays an essential role in Apéry's proof that \zeta(3) is irrational.

535 is used as an abbreviation for May 35, which is used in China instead of June 4 to evade censorship by the Chinese government of references on the Internet to the Tiananmen Square protests of 1989.

536

536 = 23 × 67. It is:

• the number of ways to arrange the pieces of the ostomachion into a square, not counting rotation or reflection.
• the number of 1's in all partitions of 23 into odd parts
• a refactorable number.
• the lowest happy number beginning with the digit 5.
• the 168th Totient number.

537

537 = 3 × 179, Mertens function (537) = 0, Blum integer, D-number

538

538 = 2 × 269. It is:

• an open meandric number.
• a nontotient.
• the total number of votes in the United States Electoral College.
  • the website FiveThirtyEight.
• Radio 538, a Dutch commercial radio station.

539

539 = 72 × 11

\sum_{n=0}^{10}{539}^{n} is prime

540s

540

540 = 22 × 33 × 5. It is:

• an untouchable number.
• a heptagonal number.
• a decagonal number.
• a repdigit in bases 26 (KK26), 29 (II29), 35 (FF35), 44 (CC44), 53 (AA53), and 59 (9959).
• a Harshad number.
• the number of doors to Valhalla according to the Prose Edda.
• the number of floors in Thor's hall, known as Bilskirnir, according to the Prose Edda.
• the sum of a twin prime (269 + 271)
• a largely composite number

541

541 is:

• the 100th prime.
• a lucky prime.
• a Chen prime.
• the 10th star number.
• palindromic in bases 18 (1C118) and 20 (17120).
• the fifth ordered Bell number that represents the number of ordered partitions of [5].
• 4541 - 3541 is prime.

For the Mertens function, M(541) = 0.

542

542 = 2 × 271. It is:

• a nontotient.
• the sum of totient function for the first 42 integers.

543

543 = 3 × 181; palindromic in bases 11 (45411) and 12 (39312), D-number.

\sum_{n=0}^{10}{543}^{n} is prime

544

544 = 25 × 17. Take a grid of 2 times 5 points. There are 14 points on the perimeter. Join every pair of the perimeter points by a line segment. The lines do not extend outside the grid. 544 is the number of regions formed by these lines.

544 is also the number of pieces that could be seen in a 5×5×5×5 Rubik's Tesseract. As a standard 5×5×5 has 98 visible pieces (53 − 33), a 5×5×5×5 has 544 visible pieces (54 − 34).

545

545 = 5 × 109. It is:

• a centered square number.
• palindromic in bases 10 (54510) and 17 (1F117).

546

546 = 2 × 3 × 7 × 13. It is:

• the sum of eight consecutive primes (53 + 59 + 61 + 67 + 71 + 73 + 79 + 83).
• palindromic in bases 4 (202024), 9 (6669), and 16 (22216).
• a repdigit in bases 9 and 16.
• 546! − 1 is prime.

547

547 is:

• a prime number.
• a cuban prime.
• a centered hexagonal number.
• a centered heptagonal number.
• a prime index prime.

548

548 = 22 × 137. It is:

• a nontotient.
• the default port for the Apple Filing Protocol. Also, every positive integer is the sum of at most 548 ninth powers;

549

549 = 32 × 61, it is:

• a repdigit in bases 13 (33313) and 60 (9960).
• φ(549) = φ(σ(549)).

550s

550

550 = 2 × 52 × 11. It is:

• a pentagonal pyramidal number.
• a primitive abundant number.
• a nontotient.
• a repdigit in bases 24 (MM24), 49 (BB49), and 54 (AA54).
• a Harshad number.
• the SMTP status code meaning the requested action was not taken because the mailbox is unavailable

551

551 = 19 × 29. It is:

• It is the number of mathematical trees on 12 unlabeled nodes.
• the sum of three consecutive primes (179 + 181 + 191).
• palindromic in base 22 (13122).
• the SMTP status code meaning user is not local

552

552 = 23 × 3 × 23. It is:

• the number of prime knots with 11 crossings.
• the sum of six consecutive primes (79 + 83 + 89 + 97 + 101 + 103).
• the sum of ten consecutive primes (37 + 41 + 43 + 47 + 53 + 59 + 61 + 67 + 71 + 73).
• a pronic number.
• an untouchable number.
• palindromic in base 19 (1A119).
• a Harshad number.
• the model number of .
• the SMTP status code meaning requested action aborted because the mailbox is full.

553

553 = 7 × 79. It is:

• the sum of nine consecutive primes (43 + 47 + 53 + 59 + 61 + 67 + 71 + 73 + 79).
• a central polygonal number.
• the model number of .
• the SMTP status code meaning requested action aborted because of faulty mailbox name.

554

554 = 2 × 277. It is:

• a nontotient.
• a 2-Knödel number
• the SMTP status code meaning transaction failed. Mertens function(554) = 6, a record high that stands until 586.

555

Main article: 555 (number)

555 = 3 × 5 × 37 is:

• a sphenic number.
• palindromic in bases 9 (6769), 10 (55510), and 12 (3A312).
• a repdigit in bases 10 and 36.
• a Harshad number.
• φ(555) = φ(σ(555)).

556

556 = 22 × 139. It is:

• the sum of four consecutive primes (131 + 137 + 139 + 149).
• an untouchable number, because it is never the sum of the proper divisors of any integer.
• a happy number.
• the model number of ; 5.56×45mm NATO cartridge.

557

557 is:

• a prime number.
• a Chen prime.
• an Eisenstein prime with no imaginary part.
• the number of parallelogram polyominoes with 9 cells.

558

558 = 2 × 32 × 31. It is:

• a nontotient.
• a repdigit in bases 30 (II30) and 61 (9961).
• a Harshad number.
• The sum of the largest prime factors of the first 558 is itself divisible by 558 (the previous such number is 62, the next is 993).
• in the title of the Star Trek: Deep Space Nine episode "The Siege of AR-558"

559

559 = 13 × 43. It is:

• the sum of five consecutive primes (103 + 107 + 109 + 113 + 127).
• the sum of seven consecutive primes (67 + 71 + 73 + 79 + 83 + 89 + 97).
• a nonagonal number.
• a centered cube number.
• palindromic in base 18 (1D118).
• the model number of .

560s

560

560 = 24 × 5 × 7. It is:

• a tetrahedral number.
• a refactorable number.
• palindromic in bases 3 (2022023) and 6 (23326).
• the number of diagonals in a 35-gon

561

561 = 3 × 11 × 17. It is:

• a sphenic number.
• the 33rd triangular number.
• a hexagonal number.
• palindromic in bases 2 (10001100012) and 20 (18120).
• the first Carmichael number

562

562 = 2 × 281. It is:

• a Smith number.
• an untouchable number.
• the sum of twelve consecutive primes (23 + 29 + 31 + 37 + 41 + 43 + 47 + 53 + 59 + 61 + 67 + 71).
• palindromic in bases 4 (203024), 13 (34313), 14 (2C214), 16 (23216), and 17 (1G117).
• a lazy caterer number .
• the number of Native American (including Alaskan) Nations, or "Tribes," recognized by the USA government. 56264 + 1 is prime

563

563 is:

• a prime number.
• a safe prime.
• the largest known Wilson prime.
• a Chen prime.
• an Eisenstein prime with no imaginary part.
• a balanced prime.
• a strictly non-palindromic number.
• a sexy prime.
• a happy prime.
• a prime index prime.
• 5563 - 4563 is prime.

564

564 = 22 × 3 × 47. It is:

• the sum of a twin prime (281 + 283).
• a refactorable number.
• palindromic in bases 5 (42245) and 9 (6869).
• number of primes 12.

565

565 = 5 × 113. It is:

• the sum of three consecutive primes (181 + 191 + 193).
• a member of the Mian–Chowla sequence.
• a happy number.
• palindromic in bases 10 (56510) and 11 (47411).

566

566 = 2 × 283. It is:

• nontotient.
• a happy number.
• a 2-Knödel number.

567

567 = 34 × 7. It is:

• palindromic in base 12 (3B312). :\sum_{n=0}^{10}{567}^{n} is prime

568

568 = 23 × 71. It is:

• the sum of the first nineteen primes (a term of the sequence ).
• a refactorable number.
• palindromic in bases 7 (14417) and 21 (16121).
• the smallest number whose seventh power is the sum of 7 seventh powers.
• the room number booked by Benjamin Braddock in the 1967 film The Graduate.
• the number of millilitres in an imperial pint.
• the name of the Student Union bar at Imperial College London

569

569 is:

• a prime number.
• a Chen prime.
• an Eisenstein prime with no imaginary part.
• a strictly non-palindromic number.

570s

570

570 = 2 × 3 × 5 × 19. It is:

• a triangular matchstick number
• a balanced number

571

571 is:

• a prime number.
• a Chen prime.
• a centered triangular number.
• the model number of which appeared in the 2000 movie U-571.
• the number of domino tilings of a 3x10 rectangle.

572

572 = 22 × 11 × 13. It is:

• a primitive abundant number.
• a nontotient.
• palindromic in bases 3 (2100123) and 15 (28215).

573

573 = 3 × 191. It is:

• a Blum integer
• known as the Konami number, since "ko-na-mi" is associated with 573 in the Japanese wordplay Goroawase
• the model number of

574

574 = 2 × 7 × 41. It is:

• a sphenic number.
• a nontotient.
• palindromic in base 9 (7079).
• number of partitions of 27 that do not contain 1 as a part.
• number of amino acid residues in a hemoglobin molecule.

575

575 = 52 × 23. It is:

• palindromic in bases 10 (57510) and 13 (35313).
• a centered octahedral number. And the sum of the squares of the first 575 primes is divisible by 575.

576

576 = 26 × 32 = 242. It is:

• the sum of four consecutive primes (137 + 139 + 149 + 151).
• a highly totient number.
• a Smith number.
• an untouchable number.
• palindromic in bases 11 (48411), 14 (2D214), and 23 (12123).
• a Harshad number.
• four-dozen sets of a dozen, which makes it 4 gross.
• a cake number.
• the number of parts in all compositions of 8.

577

577 is:

• a prime number.
• a Proth prime.
• a Chen prime.
• palindromic in bases 18 (1E118) and 24 (10124).
• the number of seats in National Assembly (France).

578

578 = 2 × 172. It is:

• a nontotient.
• palindromic in base 16 (24216).
• area of a square with diagonal 34

579

579 = 3 × 193; it is a ménage number, and a semiprime.

580s

580

580 = 22 × 5 × 29. It is:

• the sum of six consecutive primes (83 + 89 + 97 + 101 + 103 + 107).
• palindromic in bases 12 (40412) and 17 (20217).

581

581 = 7 × 83. It is:

• the sum of three consecutive primes (191 + 193 + 197).
• a Blum integer

582

582 = 2 × 3 × 97. It is:

• a sphenic number.
• the sum of eight consecutive primes (59 + 61 + 67 + 71 + 73 + 79 + 83 + 89).
• a nontotient.
• a vertically symmetric number .
• an admirable number.

583

583 = 11 × 53. It is:

• palindromic in base 9 (7179).
• number of compositions of 11 whose run-lengths are either weakly increasing or weakly decreasing

584

584 = 23 × 73. It is:

• an untouchable number.
• the sum of totient function for first 43 integers.
• a refactorable number.

585

585 = 32 × 5 × 13. It is:

• palindromic in bases 2 (10010010012), 8 (11118), and 10 (58510).
• a repdigit in bases 8, 38, 44, and 64.
• the sum of powers of 8 from 0 to 3.

When counting in binary with fingers, expressing 585 as 1001001001, results in the isolation of the index and little fingers of each hand, "throwing up the horns".

586

586 = 2 × 293.

• Mertens function(586) = 7 a record high that stands until 1357.
• 2-Knödel number.
• it is the number of several popular personal computer processors (such as the Intel Pentium).

587

587 is:

• a prime number.
• safe prime.
• a Chen prime.
• an Eisenstein prime with no imaginary part.
• the sum of five consecutive primes (107 + 109 + 113 + 127 + 131).
• palindromic in bases 11 (49411) and 15 (29215).
• the outgoing port for email message submission.
• a prime index prime.

588

588 = 22 × 3 × 72. It is:

• a Smith number.
• palindromic in base 13 (36313).
• a Harshad number.

589

589 = 19 × 31. It is:

• the sum of three consecutive primes (193 + 197 + 199).
• palindromic in base 21 (17121).
• a centered tetrahedral number.

590s

590

590 = 2 × 5 × 59. It is:

• a sphenic number.
• a pentagonal number.
• a nontotient.
• palindromic in base 19 (1C119).

591

591 = 3 × 197, D-number

592

592 = 24 × 37. It is:

• palindromic in bases 9 (7279) and 12 (41412).
• a Harshad number.

59264 + 1 is prime

593

593 is:

• a prime number.
• a Sophie Germain prime.
• the sum of seven consecutive primes (71 + 73 + 79 + 83 + 89 + 97 + 101).
• the sum of nine consecutive primes (47 + 53 + 59 + 61 + 67 + 71 + 73 + 79 + 83).
• an Eisenstein prime with no imaginary part.
• a balanced prime.
• a Leyland prime using 2 & 9 (29 + 92)
• a member of the Mian–Chowla sequence.
• a strictly non-palindromic number.

594

594 = 2 × 33 × 11. It is:

• the sum of ten consecutive primes (41 + 43 + 47 + 53 + 59 + 61 + 67 + 71 + 73 + 79).
• a nontotient.
• palindromic in bases 5 (43345) and 16 (25216).
• a Harshad number.
• the number of diagonals in a 36-gon.
• a balanced number.

595

595 = 5 × 7 × 17. It is:

• a sphenic number.
• the 34th triangular number.
• centered nonagonal number.
• palindromic in bases 10 (59510) and 18 (1F118).

596

596 = 22 × 149. It is:

• the sum of four consecutive primes (139 + 149 + 151 + 157).
• a nontotient.
• a lazy caterer number .

597

597 = 3 × 199. It is:

• a Blum integer

598

598 = 2 × 13 × 23 = 51 + 92 + 83. It is:

• a sphenic number.
• palindromic in bases 4 (211124) and 11 (4A411).
• number of non-alternating permutations of {1...6}.

599

599 is:

• a prime number.
• a Chen prime.
• an Eisenstein prime with no imaginary part.
• a prime index prime.

4599 - 3599 is prime.

References

References

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45. {{Cite OEIS
46. {{cite OEIS. A001082. Generalized octagonal numbers
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48. {{cite OEIS. A036469. Partial sums of A000009 (partitions into distinct parts)
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50. {{Cite OEIS
51. Snorri Sturluson. (1880). "Prose Edda".
52. Snorri Sturluson. (1880). "Prose Edda".
53. {{Cite OEIS
54. {{Cite OEIS
55. {{Cite OEIS. A000670. Fubini numbers: number of preferential arrangements of n labeled elements; or number of weak orders on n labeled elements; or number of ordered partitions of [n].
56. {{Cite OEIS. A059801. Numbers k such that 4^k - 3^k is prime.
57. {{cite OEIS. A002088
58. {{Cite OEIS
59. {{Cite OEIS
60. {{Cite OEIS
61. {{Cite OEIS
62. {{cite OEIS. A006872
63. {{Cite OEIS
64. {{Cite OEIS
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66. {{cite OEIS. A002863. Number of prime knots with n crossings
67. {{cite OEIS. A006958. Number of parallelogram polyominoes with n cells (also called staircase polyominoes, although that term is overused)
68. {{Cite OEIS
69. {{Cite OEIS
70. {{Cite OEIS
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72. {{Cite OEIS
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74. {{Cite OEIS
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76. {{Cite OEIS
77. {{cite OEIS. A059802. Numbers k such that 5^k - 4^k is prime
78. {{cite OEIS. A007053
79. {{Cite OEIS
80. {{cite OEIS. A045943
81. {{cite OEIS. A020492. Balanced numbers: numbers k such that phi(k) (A000010) divides sigma(k) (A000203)
82. {{cite OEIS. A002865. Number of partitions of n that do not contain 1 as a part
83. {{cite OEIS. A001845. Centered octahedral numbers (crystal ball sequence for cubic lattice)
84. {{cite OEIS. A111441. Numbers k such that the sum of the squares of the first k primes is divisible by k
85. {{Cite OEIS
86. {{cite OEIS. A001792
87. {{Cite OEIS
88. {{cite OEIS. A001105
89. {{Cite OEIS
90. {{cite OEIS. A332835. Number of compositions of n whose run-lengths are either weakly increasing or weakly decreasing
91. {{Cite OEIS. A094133. Leyland prime numbers
92. "A000217 - OEIS".
93. {{Cite OEIS