A255208 Primes p for which exactly five bases b with 1 < b < p exist such that p is a base b Wieferich prime.

653, 4909, 7723, 9811, 13691, 15413, 18133, 18223, 21061, 22147, 25679, 29131, 33923, 35353, 36913, 37633, 46021, 57527, 61819, 66107, 71059, 72643, 77867, 79867, 85061, 87509, 89113, 96757, 97213, 98641, 117977, 118163, 120247, 122209, 123653, 126443, 129061

Offset

1,1

Comments

p = prime(n) such that A242830(n) = 5.

Links

Table of n, a(n) for n=1..37.

Prog

(PARI) forprime(p=1, , b=2; i=0; while(b < p, if(Mod(b, p^2)^(p-1)==1, i++); b++); if(i==5, print1(p, ", ")))

Crossrefs

Cf. A255203, A255204, A255205, A255206, A255207, A255209, A255210.

Sequence in context: A145125 A145202 A188366 * A060520 A250701 A250158

Adjacent sequences: A255205 A255206 A255207 * A255209 A255210 A255211

Keyword

nonn

Author

Felix Fröhlich, Feb 17 2015

Status

approved