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 A133013 #7 Apr 26 2018 05:01:41
%S A133013 2,35,71113,17192329,3137414347,535961677173,79838997101103107,
%T A133013 109113127131137139149151,157163167173179181191193197,
%U A133013 199211223227229233239241251257,263269271277281283293307311313317
%N A133013 Concatenation of next n primes.
%H A133013 C. K. Caldwell, <a href="http://primes.utm.edu">The Prime Pages</a>.
%H A133013 Omar E. Pol, <a href="http://www.polprimos.com">Determinacion geometrica de los numeros primos y perfectos</a>.
%t A133013 With[{nn=15},FromDigits[Flatten[IntegerDigits/@#]]&/@TakeList[Prime[ Range[ (nn(nn+1))/2]],Range[nn]]] (* Requires Mathematica version 11 or later *) (* _Harvey P. Dale_, Apr 26 2018 *)
%Y A133013 Cf. A053067, A053068. Prime numbers: A000040.
%K A133013 easy,nonn,base
%O A133013 1,1
%A A133013 _Omar E. Pol_, Oct 19 2007