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 A228050 #5 Aug 06 2013 18:44:43 %S A228050 0,1,2,3,4,5,6,5624032642,5624033055,5624104634,5624105050,5624110136, %T A228050 102616333034,102620103253,103055445560,206154633166,206154633200, %U A228050 212216263215,212220033434,315315450515,321340554340,424436332033,424440102253,430461435550 %N A228050 The decimal representation of n is a substring of its base 7 representation. %H A228050 Giovanni Resta, <a href="/A228050/b228050.txt">Table of n, a(n) for n = 1..156</a> (terms < 10^25) %e A228050 2523016430113651303122433 = (53252301643011365130312243352)_7. %Y A228050 Cf. A038102-A038106, A228051, A228052, A227549. %K A228050 nonn,base %O A228050 1,3 %A A228050 _Giovanni Resta_, Aug 06 2013