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 A325882 #4 May 26 2019 15:00:55 %S A325882 361,476,699,977,1121,1145,1293,1667,1745,1868,2157,2382,2468,2665, %T A325882 2793,2897,3038,3149,3526,4033,4643,4746,4789,5032,5073,5567,5651, %U A325882 5660,5777,5824,6205,6320,6346,6377,6421,6732,6769,6949,6957,6976,7318,7669,7793,7937 %N A325882 Bases b where exactly six primes p with p < b exist such that p is a base-b Wieferich prime. %C A325882 Numbers n such that A255920(n) = 6. %o A325882 (PARI) is(n) = my(i=0); forprime(p=1, n-1, if(Mod(n, p^2)^(p-1)==1, i++)); i==6 %Y A325882 Cf. A255920. %Y A325882 Cf. bases b with exactly k base-b Wieferich primes less than b: A255921 (k=0), A255922 (k=1), A255923 (k=2), A255924 (k=3), A255925 (k=4), A325881 (k=5), A325883 (k=7), A325884 (k=8), A325885 (k=9), A325886 (k=10). %K A325882 nonn %O A325882 1,1 %A A325882 _Felix Fröhlich_, May 26 2019