141 (number)

141 1, 3, 47, 141 141 (one hundred [and] forty-one) is the natural number following 140 and preceding 142. In mathematics 141 is: a centered pentagonal number.https://oeis.org/A005891 Sloane's A005891 : Centered pentagonal numbers The On-Line Encyclopedia of Integer Sequences OEIS Foundation 2016-05-27 the sum of the sums of the divisors of the first 13 positive integers.A024916 sum_{k=1..n} sigma(k) where sigma(n) = sum of divisors of n the second n to give a prime Cullen number (of the form n2n + 1).Wells, D. The Penguin Dictionary of Curious and Interesting Numbers London: Penguin Group. (1987): 139 the first three digits after the decimal point in the base 10 representation of pi (3.141592...) an undulating number in base 10, with the previous being 131, and the next being 151. the sixth hendecagonal (11-gonal) number.https://oeis.org/A051682 Sloane's A051682 : 11-gonal (or hendecagonal) numbers The On-Line Encyclopedia of Integer Sequences OEIS Foundation 2016-05-27 a semiprime: a product of two prime numbers, namely 3 and 47. Since those prime factors are Gaussian primes, this means that 141 is a Blum integer. a Hilbert prime Sometimes used as an acronym [1 representing A and 4 representing D] to stand for Anti Deforestation Action, often used by radical environmentalists References 1 Category:Integers