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The number 1387 is a square-free number with prime factors 19 and 73. The prime factorization is:

Properties and families

Property or family Parameter values First few members Proof of membership/containment/satisfaction
Poulet number (Fermat pseudoprime to base 2) fifth among them 341, 561, 645, 1105, 1387, 1729, 1905, 2047, [SHOW MORE] View list on OEIS Fill this in later