Thomas J. Hruska wrote:
Stephan V Bechtolsheim wrote:
To be sure we should use another library:
$ cat gmp5.c
#include <stdio.h>
#include <gmp.h>
...
To be sure one needs to go back to the mathematical definition of what is a prime.

To use a program as proof is really not a proof. What you have proven is that GMP is correct in determining that 2 is a prime number, not that 2 is a prime number.

StvB

Any positive integer greater than one (1) that is divisible only by itself and one (1) is a prime number.

Oops. Forgot the word "evenly". "that is evenly divisible" - i.e. no remainder.

That's a basic 3rd grade definition. Wikipedia and Wolfram's MathWorld have more elaborate definitions:

http://en.wikipedia.org/wiki/Prime_number
http://mathworld.wolfram.com/PrimeNumber.html



--
Thomas Hruska
Shining Light Productions

Home of BMP2AVI, Nuclear Vision, ProtoNova, and Win32 OpenSSL.
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