193 (number)

193 (number)

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

In mathematics

193 is a prime number, the only odd prime "p" known for which 2 is not a primitive root of 4p^2 + 1. [E. Friedman, " [http://www.stetson.edu/~efriedma/numbers.html 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 4"n"2 + 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.

References


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