A339537 Numbers b > 1 such that the smallest eight primes, i.e., 2, 3, 5, 7, 11, 13, 17 and 19 are base-b Wieferich primes.

126664001, 133487693, 141313157, 236176001, 242883757, 356977349, 358254649, 383691493

Offset: 1

Author

Felix Fröhlich, Dec 08 2020

Keywords

• nonn
• more

Crossrefs

Cf. A256236. Row 1 of A319065.

Cf. smallest k primes are base-b Wieferich primes: A339531 (k=2), A339532 (k=3), A339533 (k=4), A339534 (k=5), A339535 (k=6), A339536 (k=7).

Programs

PARI

is(n) = forprime(p=1, 19, if(Mod(n, p^2)^(p-1)!=1, return(0))); 1