141 (number)
| ||||
|---|---|---|---|---|
| Cardinal | one hundred forty-one | |||
| Ordinal | 141st (one hundred forty-first) | |||
| Factorization | 3 × 47 | |||
| Divisors | 1, 3, 47, 141 | |||
| Greek numeral | ΡΜΑ´ | |||
| Roman numeral | CXLI, cxli | |||
| Binary | 100011012 | |||
| Ternary | 120203 | |||
| Senary | 3536 | |||
| Octal | 2158 | |||
| Duodecimal | B912 | |||
| Hexadecimal | 8D16 | |||
141 (one hundred [and] forty-one) is the natural number following 140 and preceding 142.
In mathematics
[edit]141 is:
- a centered pentagonal number.[1]
- the sum of the sums of the divisors of the first 13 positive integers.[2]
- the second n to give a prime Cullen number (of the form n2n + 1).[3]
- an undulating number in base 10, with the previous being 131, and the next being 151.
- the sixth hendecagonal (11-gonal) number.[4]
- 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
References
[edit]- ^ "Sloane's A005891 : Centered pentagonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-27.
- ^ Sloane, N. J. A. (ed.). "Sequence A024916 (sum_{k=1..n} sigma(k) where sigma(n) = sum of divisors of n)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Wells, D. The Penguin Dictionary of Curious and Interesting Numbers London: Penguin Group. (1987): 139
- ^ "Sloane's A051682 : 11-gonal (or hendecagonal) numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-27.