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 A064826 #2 May 11 2007 03:00:00 %S A064826 211,215,352,381,447,602,660,663,766,807,853,874,1002,1172,1197,1248, %T A064826 1259,1372,1427,1457,1571,1612,1622,1639,1652,1665,1752,1850,1862, %U A064826 1927,1996,2047,2152,2245,2297,2302,2332,2351,2415,2472,2497,2506,2523,2618 %N A064826 Numbers which are the sum of two pentagonal numbers (A000326) in exactly two different ways. %C A064826 211 = 176 + 35 = 210+1 %Y A064826 A064816, A000326. %K A064826 nonn %O A064826 1,1 %A A064826 Jonathan Ayres (jonathan.ayres(AT)btinternet.com), Oct 23 2001