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Using results from J. Sorenson and J. Webster, Strong pseudoprimes to twelve prime bases, Math. Comp. 86(304):985-1003, 2017. teach primes(6) to enumerate primes up to 2^64 - 1. Until Sorenson and Webster's paper, we did not know how many strong speudoprime tests were required when testing alleged primes between 3825123056546413051 and 2^64 - 1. Adapted from: FreeBSD