At 10:24 PM 2/16/00 +0900, Kotera Hiroshi" (Kotera Hiroshi wrote:
>Is a decimal 23-digit numbers 11111111111111111111111 prime ?
>Could you tell me the answer with proof?
Yes--this is small so you could divide by all integers to the square root.
See http://www.utm.edu/research/primes/prove/ for faster ways.
If you use 317 or 1031 digits it is also a known prime. 49081 '1's gives a
probable-prime. See
http://www.utm.edu/research/primes/glossary/Repunit.html
Chris Caldwell
[EMAIL PROTECTED]
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