A255210 Primes p for which exactly seven bases b with 1 < b < p exist such that p is a base-b Wieferich prime.

103291, 491531, 534851, 804367, 997961, 1026899, 1062427, 1457389, 1550513, 2327629, 2602307, 3093121, 3137257, 3181481, 3412741, 3497381, 3720179, 3814253, 4087301, 4234057, 4891973, 5063087, 5131237, 5194789, 5736611, 6253349, 6903191, 6906469, 6945047

Offset

1,1

Comments

p = prime(n) such that A242830(n) = 7.

Links

Table of n, a(n) for n=1..29.

R. Fischer, Thema: Fermatquotient B^(P-1) == 1 (mod P^2) Fermatquotienten mit extremen Erst-Basen

Prog

(PARI) forprime(p=1, , b=2; i=0; while(b < p, if(Mod(b, p^2)^(p-1)==1, i++); b++); if(i==7, print1(p, ", ")))

Crossrefs

Cf. A255203, A255204, A255205, A255206, A255207, A255208, A255209.

Sequence in context: A250704 A250941 A237572 * A147526 A269218 A237894

Adjacent sequences: A255207 A255208 A255209 * A255211 A255212 A255213

Keyword

nonn

Author

Felix Fröhlich, Mar 07 2015

Status

approved