A325885 Bases b where exactly nine primes p with p < b exist such that p is a base-b Wieferich prime.

10768, 24599, 27557, 29957, 33301, 35397, 45009, 49085, 55241, 60661, 63290, 69389, 89101, 90607, 93657, 101305, 103751, 105657, 117618, 120473, 123824, 126449, 129473, 132857, 133524, 133948, 138149, 138896, 143882, 147717, 150793, 152985, 159317, 168920

Offset

1,1

Comments

Numbers n such that A255920(n) = 9.

Links

Table of n, a(n) for n=1..34.

Prog

(PARI) is(n) = my(i=0); forprime(p=1, n-1, if(Mod(n, p^2)^(p-1)==1, i++)); i==9

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), A325884 (k=8), A325886 (k=10).

Sequence in context: A258506 A254993 A023084 * A034231 A229275 A345572

Adjacent sequences: A325882 A325883 A325884 * A325886 A325887 A325888

Keyword

nonn

Author

Felix Fröhlich, May 26 2019

Status

approved