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 A092681 #8 Nov 24 2021 03:05:33 %S A092681 284,914,3292,5768,228,12112,11082,6302,11498,40220,34724,51976,1434, %T A092681 74750,67316,21508,63532,39378,67066,64012,91576,137766,137552,105582, %U A092681 158838,147660,175758,194776,173842,102148,132072,107112,127736,29248 %N A092681 Least number 2k such that p^2 divides the numerator of the Bernoulli number B(2k), where p is the n-th irregular prime, A000928(n). %C A092681 The ordered-pair (p(n),a(n)), where p(n) is the n-th irregular prime, is called a second-order irregular pair. Some irregular primes, such as 157, have more than one pair. See A091887 for a count of the pairs for each irregular prime. %H A092681 Bernd Kellner, <a href="http://www.bernoulli.org/~bk/irrpairord.pdf">On irregular pairs of higher order (in German)</a> %Y A092681 Cf. A000928, A035112, A091887, A092682. %K A092681 nonn %O A092681 1,1 %A A092681 _T. D. Noe_, Mar 03 2004