193 (number)

From Wikipedia, the free encyclopedia

 This article needs additional citations for verification.
Please help improve this article by adding reliable references. Unsourced material may be challenged and removed. (August 2007)

193 is the natural number between 192 and 194. It is also a prime number.

List of numbers — Integers

<< 190 191 192 193 194 195 196 197 198 199 >>
Cardinal One hundred [and]
ninety-three
Ordinal 193rd
Factorization prime number
Roman numeral CXCIII
Binary 11000001
Hexadecimal C1

[edit] In mathematics

193 is a prime number, the only odd prime p known for which 2 is not a primitive root of 4p2 + 1.[1] 193 is a cuban prime, and a twin prime with 191. It is also a happy and lucky prime. 193 is a Proth prime as it is 3 × 26 + 1. It can be written as the difference between the product and the sum of the first four primes.

[edit] References

  1. ^ E. Friedman, "What's Special About This Number" Accessed 2 January 2006 and again 15 August 2007. "193 is the only known odd prime n for which 2 is not a primitive root of 4n2 + 1"
abc  This number article is a stub. You can help by expanding it.