141 (number)

← 140 141 142 →
← 140 141 142 143 144 145 146 147 148 149 → List of numbers Integers ← 0 100 200 300 400 500 600 700 800 900 →
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

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]
• 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. ^[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

1. "Sloane's A005891 : Centered pentagonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-27.
2. Sloane, N. J. A. (ed.). "SequenceA024916(sum_{k=1..n} sigma(k) where sigma(n) = sum of divisors of n)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
3. Wells, D. The Penguin Dictionary of Curious and Interesting Numbers London: Penguin Group. (1987): 139
4. "Sloane's A051682 : 11-gonal (or hendecagonal) numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-27.