141 (number)
{{Infobox number
| number = 141
| divisor = 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.{{Cite web|url=https://oeis.org/A005891|title=Sloane's A005891 : Centered pentagonal numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-05-27}}
- the sum of the sums of the divisors of the first 13 positive integers.{{Cite OEIS|A024916|name=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
- an undulating number in base 10, with the previous being 131, and the next being 151.
- the sixth hendecagonal (11-gonal) number.{{Cite web|url=https://oeis.org/A051682|title=Sloane's A051682 : 11-gonal (or hendecagonal) numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=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