161 (number)

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 <300 to that number.

In other fields

• 161 as a code for Anti-Fascist Action (A=1, F=6, by order of the alphabet), sometimes used in 161>88 (88 being code for Heil Hitler among neo-nazis, as H=8)

External links

• Number Facts and Trivia: 161
• The Number 161
• VirtueScience: 161

References