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 A095870 #4 Mar 30 2012 17:29:16 %S A095870 1,10,120,17020,20503,156520,1087075,1021735,1026028,1053426,104653, %T A095870 10623745,10280845,1004653,10568503,10725396,10762480,12890503, %U A095870 10348975,10394520,101495628,100543290,102495403,100359028,104972805,124780503 %N A095870 Least triangular number whose digit permutations yield exactly n further triangular numbers. %e A095870 20503 yields 253, 325, 23005 and 52003. %Y A095870 Cf. A069674, A077671, A095869. %K A095870 nonn,base %O A095870 0,2 %A A095870 _Ray Chandler_, Jun 29 2004