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 A032661 #7 Mar 09 2015 09:35:18 %S A032661 33,67,13,25,15,49,511,613,5967,211,111,415,517,619,115,621,319,219, %T A032661 321,1029,727,223,729,427,327,429,127,1441,129,231,535,1041,133,235, %U A032661 135,237,339,643,745,241,141,1455,2163,1053,1155,651,349,451,553,655 %N A032661 Lucky numbers that are the smallest decimal concatenations of n with n + (0,1,2,3,...). %C A032661 First terms of sequences A032650-A032659, continued with displacements d > 9. %e A032661 20th term is lucky number 1029: 29 - 10 = displacement 19 (=20-1). %Y A032661 Cf. A000959, A032660. %K A032661 nonn,base %O A032661 0,1 %A A032661 _Patrick De Geest_, May 15 1998 %E A032661 Edited by _Charles R Greathouse IV_, Apr 30 2010