| #### 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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