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 A344280 #33 May 17 2021 08:49:56 %S A344280 0,1,175,368050005576 %N A344280 Numbers that are both 10-gonal numbers (A001107) and 10-gonal pyramidal numbers (A007585). %C A344280 Intersection of A001107 and A007585. %H A344280 Numberphile, <a href="https://www.numberphile.com/cannon-ball-numbers">Cannon Ball Numbers</a>. %o A344280 (PARI) for(k=0, 1e4, if(ispolygonal(m=k*(k+1)*(8*k-5)/6, 10), print1(m", "))) %Y A344280 Cf. A001107, A007585, A027568, A344376, A344377. %K A344280 nonn,more %O A344280 1,3 %A A344280 _Seiichi Manyama_, May 17 2021