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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. 6
126664001, 133487693, 141313157, 236176001, 242883757, 356977349, 358254649, 383691493 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..8.

PROG

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

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).

Sequence in context: A227151 A227274 A162450 * A319065 A334346 A115301

Adjacent sequences:  A339534 A339535 A339536 * A339538 A339539 A339540

KEYWORD

nonn,more

AUTHOR

Felix Fröhlich, Dec 08 2020

STATUS

approved

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Last modified May 8 12:57 EDT 2021. Contains 343666 sequences. (Running on oeis4.)