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 A132932 #7 Nov 06 2015 01:59:42
%S A132932 4,46,468,4689,468910,46891012,4689101214,468910121415,46891012141516,
%T A132932 4689101214151618,468910121415161820,46891012141516182021,
%U A132932 4689101214151618202122,468910121415161820212224
%N A132932 Concatenation of first n composite numbers.
%o A132932 (PARI) lista(nn) = {s = ""; forcomposite(n=1, nn, s = concat(s, Str(n)); print1(eval(s), ", "););} \\ _Michel Marcus_, Nov 06 2015
%Y A132932 Composite numbers: A002808. Cf. A007908, A019518.
%K A132932 easy,nonn,base
%O A132932 1,1
%A A132932 _Omar E. Pol_, Sep 12 2007
%E A132932 Edited by _Charles R Greathouse IV_, Apr 28 2010
%E A132932 Offset set to 1 by _Michel Marcus_, Nov 06 2015