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D.12.2.38 find_first_primitive_root

Procedure from library crypto.lib (see crypto_lib).

Usage:
find_first_primitive_root(mod1)

Return:
First primitive root modulo mod1, 0 if no root can be found.

Example:
 
LIB "crypto.lib";
ring r = 0,x,lp;
find_first_primitive_root(7);
==> 3
find_first_primitive_root(557);
==> 2

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