A339536 Numbers b > 1 such that the smallest seven primes, i.e., 2, 3, 5, 7, 11, 13 and 17 are base-b Wieferich primes.

4486949, 4651993, 4941649, 5571593, 11903257, 19397501, 19841257, 19942001, 20610901, 21530501, 25793893, 42969601, 44404093, 46336949, 51509701, 52786493, 53740457, 54561401, 56120257, 56904857, 63789749, 64028593, 65497301, 65666449, 68441957, 72582101

Offset

1,1

Links

Table of n, a(n) for n=1..26.

Prog

(PARI) is(n) = forprime(p=1, 17, if(Mod(n, p^2)^(p-1)!=1, return(0))); 1

Crossrefs

Cf. A256236. Row 1 of A319064.

Cf. smallest k primes are base-b Wieferich primes: A339531 (k=2), A339532 (k=3), A339533 (k=4), A339534 (k=5), A339535 (k=6), A339537 (k=8).

Sequence in context: A105649 A350187 A015337 * A319064 A344831 A183679

Adjacent sequences: A339533 A339534 A339535 * A339537 A339538 A339539

Keyword

nonn

Author

Felix Fröhlich, Dec 08 2020

Status

approved