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 A333007 #17 Mar 09 2020 03:15:39 %S A333007 36,121,196,400,625,1225,1521,3481,5776,7056,7225,8464,8836,9025,9216, %T A333007 10816,11025,11664,13456,15129,15625,16641,17689,18496,21609,23409, %U A333007 24649,25600,28561,30276,32761,34596,35721,36100,36864,37636,38025,39204,40000,42436,42849 %N A333007 Perfect squares that are sum of two nonzero pentagonal numbers. %H A333007 Peter Kagey, <a href="/A333007/b333007.txt">Table of n, a(n) for n = 1..1000</a> %e A333007 36 = 6^2 = 1 + 35; %e A333007 121 = 11^2 = 51 + 70; %e A333007 196 = 14^2 = 51 + 145. %o A333007 (PARI) is(k) = issquare(k) && sum(i=1, sqrt(1+12*k)\6, sqrt(1+24*k+12*i-36*i*i)%6==5)>0; \\ _Jinyuan Wang_, Mar 06 2020 %Y A333007 Cf. A000326, A332987, A332988, A333008, A333009. %K A333007 nonn,easy %O A333007 1,1 %A A333007 _Olivier Gérard_, Mar 05 2020 %E A333007 More terms from _Jinyuan Wang_, Mar 06 2020