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 A136361 #15 Sep 16 2018 16:37:41
%S A136361 3,5,31,132,1068,9672,50664,145060
%N A136361 Square roots of the perfect squares in A136360; or numbers k such that k^4 is in A133459 = the sums of two nonzero pentagonal pyramidal numbers.
%C A136361 Corresponding perfect squares in A136360 are a(n)^2 = {9, 25, 961, 17424, ...}. They correspond to the perfect fourth powers in A133459 = Sums of two nonzero pentagonal pyramidal numbers. a(n)^4 are the terms of A133459: {81, 525, 923521, 303595776, ...}. Note that the first three terms are prime.
%C A136361 a(9) > (5*10^20)^(1/4). - _Donovan Johnson_, Jun 12 2011
%Y A136361 Cf. A136359, A136360, A133459, A002311, A002411, A053721.
%K A136361 more,nonn
%O A136361 1,1
%A A136361 _Alexander Adamchuk_, Dec 25 2007
%E A136361 Name corrected and a(5)-a(6) from _Donovan Johnson_, Nov 20 2010
%E A136361 a(7)-a(8) from _Donovan Johnson_, Jun 12 2011