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 A132934 #15 Jan 04 2017 15:15:00
%S A132934 1,14,146,1468,14689,1468910,146891012,14689101214,1468910121415,
%T A132934 146891012141516,14689101214151618,1468910121415161820,
%U A132934 146891012141516182021,14689101214151618202122,1468910121415161820212224,146891012141516182021222425
%N A132934 Concatenation of first n nonprime numbers.
%C A132934 a(360) has 1001 decimal digits. - _Michael De Vlieger_, Jan 03 2017
%H A132934 Michael De Vlieger, <a href="/A132934/b132934.txt">Table of n, a(n) for n = 1..359</a>
%t A132934 Table[FromDigits@ Flatten@ Map[IntegerDigits, Take[#, n]], {n, Length@ #}] &@ Select[Range@ 30, ! PrimeQ@ # &] (* _Michael De Vlieger_, Jan 03 2017 *)
%Y A132934 Cf. A007908, A018252, A019518.
%K A132934 easy,nonn,base
%O A132934 1,2
%A A132934 _Omar E. Pol_, Sep 12 2007