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 A108770 #4 Dec 15 2017 17:36:50 %S A108770 3,10,15,20,27,37,59,92,105,120,152,155,175,190,215,219,242,245,254, %T A108770 255,277,300,302,307,325,337,362,365,370,402,415,614,930,944,987,1049, %U A108770 1059,1112,1192,1204,1210,1220,1265,1312,1344,1360,1374,1449,1460,1504,1527 %N A108770 Numbers n such that n^2 + (n+1)^2 is a brilliant number. %C A108770 Consecutive terms are (254,255) (4099,4100) (11159,11160) (25094,25095) (31754,31755) (40189,40190) ... Conjecture: There are infinitely many consecutive values. %e A108770 92 is a term because 92^2 + 93^2 = 17113 = 109*157 and both of its %e A108770 factors have three digits. %Y A108770 Cf. A078972, A027861. %K A108770 base,easy,nonn %O A108770 1,1 %A A108770 _Jason Earls_, Jun 25 2005