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 A332985 #10 Mar 09 2020 20:58:30 %S A332985 3,4,8,14,32,34,41,42,46,47,49,53,58,63,66,67,69,71,76,79,82,86,89,90, %T A332985 100,101,102,110,113,117,124,129,141,151,159,168,175,178,183,186,192, %U A332985 195,205,216,217,219,232,241,247,250,252,253,255,258,261,263,265,271,284,293,297,298 %N A332985 Index of triangular numbers that are sum of two pentagonal numbers (A332984). %C A332985 The index of a triangular number T is the integer n such that T = n*(n+1)/2. %H A332985 Peter Kagey, <a href="/A332985/b332985.txt">Table of n, a(n) for n = 1..1000</a> %Y A332985 Cf. A000217 (triangular numbers), A000326 (pentagonal numbers), A332987 (sums of two nonzero pentagonal numbers). %K A332985 nonn,easy %O A332985 1,1 %A A332985 _Olivier Gérard_, Mar 05 2020