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 A344377 #25 May 17 2021 08:50:04 %S A344377 0,1,23725,1519937678700,7248070597636 %N A344377 Numbers that are both 11-gonal numbers (A051682) and 11-gonal pyramidal numbers (A007586). %C A344377 Intersection of A051682 and A007586. %H A344377 Numberphile, <a href="https://www.numberphile.com/cannon-ball-numbers">Cannon Ball Numbers</a>. %o A344377 (PARI) for(k=0, 1e5, if(ispolygonal(m=k*(k+1)*(3*k-2)/2, 11), print1(m", "))) %Y A344377 Cf. A007586, A027568, A051682, A344280, A344376. %K A344377 nonn,more %O A344377 1,3 %A A344377 _Seiichi Manyama_, May 17 2021