A325884 Bases b where exactly eight primes p with p < b exist such that p is a base-b Wieferich prime.

1693, 5937, 8201, 9035, 9066, 12943, 13499, 14773, 19065, 24841, 25298, 27382, 28601, 28657, 32074, 37993, 39789, 40276, 41749, 42893, 44425, 46307, 46657, 46924, 47899, 49099, 50471, 52757, 53576, 55737, 56026, 56193, 56645, 57221, 57853, 58445, 59216, 59249

Offset

1,1

Comments

Numbers n such that A255920(n) = 8.

Links

Table of n, a(n) for n=1..38.

Prog

(PARI) is(n) = my(i=0); forprime(p=1, n-1, if(Mod(n, p^2)^(p-1)==1, i++)); i==8

Crossrefs

Cf. A255920.

Cf. bases b with exactly k base-b Wieferich primes less than b: A255921 (k=0), A255922 (k=1), A255923 (k=2), A255924 (k=3), A255925 (k=4), A325881 (k=5), A325882 (k=6), A325883 (k=7), A325885 (k=9), A325886 (k=10).

Sequence in context: A252429 A126720 A366644 * A224605 A252570 A235182

Adjacent sequences: A325881 A325882 A325883 * A325885 A325886 A325887

Keyword

nonn

Author

Felix Fröhlich, May 26 2019

Status

approved