A255209 Primes p for which exactly six bases b with 1 < b < p exist such that p is a base b Wieferich prime.

5107, 20771, 51427, 52517, 61417, 66161, 116731, 119359, 128657, 140741, 147647, 150559, 199783, 203773, 213949, 229939, 237283, 261761, 286751, 288929, 303089, 339139, 342373, 381853, 384611, 385657, 475897

Offset

1,1

Comments

p = prime(n) such that A242830(n) = 6.

Links

Table of n, a(n) for n=1..27.

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==6, print1(p, ", ")))

Crossrefs

Cf. A255203, A255204, A255205, A255206, A255207, A255208, A255210.

Sequence in context: A025401 A343987 A343986 * A261462 A215839 A258729

Adjacent sequences: A255206 A255207 A255208 * A255210 A255211 A255212

Keyword

nonn,more

Author

Felix Fröhlich, Feb 17 2015

Status

approved