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 A344376 #34 Dec 21 2024 01:00:41 %S A344376 0,1,1045,5985,123395663059845,774611255177760 %N A344376 Numbers that are both octagonal numbers (A000567) and octagonal pyramidal numbers (A002414). %C A344376 Terms correspond to integral points on an elliptic curve, which allows all of them to be found efficiently. - _Max Alekseyev_, Feb 19 2024 %o A344376 (PARI) for(k=0, 1e5, if(ispolygonal(m=k*(k+1)*(2*k-1)/2, 8), print1(m", "))) %Y A344376 Intersection of A000567 and A002414. %Y A344376 Cf. A027568, A334012. %Y A344376 Cf. A378361 (octagonal indices), A378918 (octagonal pyramidal indices). %K A344376 nonn,fini,full %O A344376 1,3 %A A344376 _Seiichi Manyama_, May 16 2021 %E A344376 Keywords 'fini' and 'full' added by _Max Alekseyev_, Feb 19 2024