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141 (number) : ウィキペディア英語版 | 141 (number)
141 (one hundred () forty-one) is the natural number following 140 and preceding 142. ==In mathematics==
141 is a centered pentagonal number. It is the sum of the sums of divisors of the first thirteen integers. 141 is the second ''n'' to give a prime Cullen number (of the form ''n''2''n'' + 1).〔Wells, D. ''The Penguin Dictionary of Curious and Interesting Numbers'' London: Penguin Group. (1987): 139〕 141 is an undulating number in base 10, with the previous being 131, and the next being 151. 141 is the sixth hendecagonal (11-gonal) number. 141 is 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.
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