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 A332988 #8 Apr 22 2020 18:33:57
%S A332988 6,13,17,23,27,34,36,40,47,52,56,57,63,71,73,75,82,86,92,93,97,104,
%T A332988 105,114,118,121,122,127,129,139,143,146,150,152,157,162,167,168,177,
%U A332988 180,181,187,188,196,198,209,211,215,222,227,232,237,245,246,248,252,259,261,262,268,269,280,282,288,292,293,298,299,302,309,317,321,322,327,331,335,338,339,342,352,355,357,364,365,377,379,381,386,388,392,398
%N A332988 Sums of two distinct nonzero pentagonal numbers.
%C A332988 A subset of A332987.
%t A332988 Total/@Subsets[PolygonalNumber[5,Range[20]],{2}]//Union (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, Apr 22 2020 *)
%Y A332988 Cf. A000326 (pentagonal numbers).
%K A332988 nonn,easy
%O A332988 1,1
%A A332988 _Olivier Gérard_, Mar 05 2020