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 A069792 #10 Dec 15 2017 17:35:52
%S A069792 1,3,6,10,15,21,28,36,45,78,3741,4005,4278,14028,224115,238395,258121,
%T A069792 994755,1104841,2440945,4601061,19185915,26451901,27073761,38250631,
%U A069792 611712753,1787631321,3620877351,4427640253,16786524835,60302220121,65003739895,226236074130,367188935361,6710200324191
%N A069792 Triangular numbers in A062918.
%o A069792 (PARI) rev(n) = eval(concat(Vecrev(Str(n))));
%o A069792 lista(nn) = {s = 0; for (n=1, nn, s += rev(n); if (ispolygonal(s, 3), print1(s, ", ")););} \\ _Michel Marcus_, Sep 15 2015
%Y A069792 Cf. A062918.
%K A069792 base,nonn
%O A069792 1,2
%A A069792 _Amarnath Murthy_, Apr 09 2002
%E A069792 More terms from _Jason Earls_, May 16 2002
%E A069792 More terms from _Michel Marcus_, Sep 15 2015