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(Top) 1 In mathematics 2 See also 3 References

191 (number)

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191

← 190 191 192 193 194 195 196 197 198 199 →

List of numbers

← 0 100 200 300 400 500 600 700 800 900 →

one hundred ninety-one

191st
(one hundred ninety-first)

43rd

ΡϞΑ´

CXCI

10111111₂

21002₃

515₆

277₈

13B₁₂

BF₁₆

191 (one hundred [and] ninety-one) is the natural number following 190 and preceding 192.

In mathematics[edit]

191 is a prime number, part of a prime quadruplet of four primes: 191, 193, 197, and 199.^[1] Because doubling and adding one produces another prime number (383), 191 is a Sophie Germain prime.^[2] It is the smallest prime that is not a full reptend primeinany base from 2 to 10; in fact, the smallest base for which 191 is a full period prime is base 19.^[3]

See also[edit]

191 (disambiguation)

References[edit]

^ Sloane, N. J. A. (ed.). "Sequence A136162 (List of prime quadruplets {p, p+2, p+6, p+8})". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.

^ Sloane, N. J. A. (ed.). "Sequence A005384 (Sophie Germain primes p: 2p+1 is also prime)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.

^ Wolfram MathWorld; Primitive Root

Wikimedia Commons has media related to 191 (number).

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