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161 (number)
| Field | Value |
|---|---|
| number | 161 |
| divisor | 1, 7, 23, 161 |
161 (one hundred [and] sixty-one) is the natural number following 160 and preceding 162.
In mathematics
- 161 is the sum of five consecutive prime numbers: 23, 29, 31, 37, and 41.
- 161 is a hexagonal pyramidal number.
- 161 is a semiprime. Since its prime factors 7 and 23 are both Gaussian primes, 161 is a Blum integer.
- 161 is a palindromic number.
- is a commonly used rational approximation of the square root of 5 and is the closest fraction with denominator
In other fields
- 161 as a code for Anti-Fascist Action (A=1, F=6, by order of the alphabet), sometimes used in 16188 (88 being code for Heil Hitler among neo-nazis, as H=8)
References
References
- "Sloane's A002412 : Hexagonal pyramidal numbers". OEIS Foundation.
- "A002113 - Oeis".
- (2012). "161>88". Antifascist Action.
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