This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A339537 #4 Dec 12 2020 06:17:32 %S A339537 126664001,133487693,141313157,236176001,242883757,356977349, %T A339537 358254649,383691493 %N 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. %o A339537 (PARI) is(n) = forprime(p=1, 19, if(Mod(n, p^2)^(p-1)!=1, return(0))); 1 %Y A339537 Cf. A256236. Row 1 of A319065. %Y A339537 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). %K A339537 nonn,more %O A339537 1,1 %A A339537 _Felix Fröhlich_, Dec 08 2020