http://benji3up2kxewkqfcq7buxk2xd6zwy3zggnurkrm3l4cvwy2iipvyyad.onion/mirrors/gmpdoc/I_002fO-of-Integers.html
See also Formatted Output and Formatted Input . Function: size_t mpz_out_str (FILE * stream , int base , const mpz_t op ) ¶ Output op on stdio stream stream , as a string of digits in base base . The base argument may vary from 2 to 62 or from −2 to
−36.