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 A122272 #31 May 13 2020 08:53:12 %S A122272 1250,3750,4802,6250,8750,9604 %N A122272 Numbers m such that the numerator of the Bernoulli number B(m) is divisible by p^4, where p is prime. %C A122272 For each m in the current sequence, the smallest prime p such that p^4 divides the numerator of the Bernoulli number B(m) is listed in A122273. %C A122272 Note that the numerator of B(6250) is divisible by 5^5. %C A122272 The current sequence is a subsequence of A122270, which are the numbers m such that the numerator of the Bernoulli number B(m) is divisible by a cube. %C A122272 Sequence A122270 itself is a subsequence of A090997, which are the numbers m such that the numerator of the Bernoulli number B(m) is divisible by a square. [Edited by _Petros Hadjicostas_, May 12 2020] %H A122272 The Bernoulli Number Page, <a href="https://www.bernoulli.org/download/bn_factors.txt">Table of factors of the numerators of Bernoulli numbers Bn in the range n = 2..10000</a>, 2018. %H A122272 S. S. Wagstaff, Jr, <a href="http://www.cerias.purdue.edu/homes/ssw/bernoulli/bnum">Prime factors of the absolute values of Bernoulli numerators</a>, 2018. %e A122272 a(1) = 1250 because 5^4 divides numerator(B(1250)). %e A122272 a(3) = 4802 because 7^4 divides numerator(B(4802)). %Y A122272 Cf. A000367, A090987, A090997, A122270, A122271, A122273. %K A122272 nonn,more %O A122272 1,1 %A A122272 _Alexander Adamchuk_, Aug 28 2006