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 A099148 #4 Mar 31 2012 20:47:17 %S A099148 2,3,8,9,14,15,20,39,77,98,99,138,158,164,177,200,399,492,614,998,999, %T A099148 1065,1383,1505,1598,1797,1859,1920,2000,2655,3077,3213,3762,3999,6707 %N A099148 Take a <= b such that f(a)+f(b)=concatenation of a and b, where f(k)=k(k+3)/2 (A000096). Sequence gives values of a. %C A099148 For values of b, see A099149. %Y A099148 Cf. A096032, A099149. %K A099148 nonn,base %O A099148 1,1 %A A099148 _John W. Layman_, Sep 30 2004 %E A099148 Edited by _Charles R Greathouse IV_, Apr 23 2010