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 A122271 #28 Sep 15 2024 20:23:49 %S A122271 5,7,5,5,7,5,5,11,7,5,5,7,5,5,13,5,7,5,7,5,5,5,7,5,7,5,11,5,5,13,7,5, %T A122271 7,5,17 %N A122271 a(n) is the smallest prime whose cube divides the numerator of the Bernoulli number B(A122270(n)). %H A122271 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 A122271 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 A122271 a(1) = 5 because 5^3 divides numerator(B(A122270(1))) = numerator(B(250)), but 3^3 does not. %Y A122271 Cf. A000367, A090997, A090987, A122270, A122272, A122273. %K A122271 nonn,more %O A122271 1,1 %A A122271 _Alexander Adamchuk_, Aug 28 2006 %E A122271 Various sections edited by _Petros Hadjicostas_, May 12 2020