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 A378918 #6 Dec 21 2024 01:00:53 %S A378918 0,1,10,18,49785,91839 %N A378918 Indices of octagonal pyramidal numbers that are both octagonal and octagonal pyramidal. %F A378918 A344376(n) = A002414(a(n)). %e A378918 10 is a term because the 10th octagonal pyramidal number (1045) is also the 19th octagonal number. %Y A378918 Cf. A000567 (octagonal numbers), A002414 (octagonal pyramidal numbers). %Y A378918 Cf. A344376. %Y A378918 Cf. A378361 (octagonal indices). %K A378918 nonn,fini,full %O A378918 1,3 %A A378918 _Kelvin Voskuijl_, Dec 10 2024