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D.12.3.39 is_prime

Procedure from library crypto.lib (see crypto_lib).

Usage:
is_prime(n)

Return:
1 if n is prime, 0 otherwise

Example:
 
LIB "crypto.lib";
ring r = 0,x,lp;
is_prime(10);
==> 0
is_prime(7);
==> 1