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 A132933 #2 Mar 30 2012 17:33:49 %S A132933 2,23,235,2357,235723,23572337,2357233753,235723375373, %T A132933 235723375373223,235723375373223227,235723375373223227233, %U A132933 235723375373223227233257,235723375373223227233257277,235723375373223227233257277337 %N A132933 Concatenation of first n primes whose digits are primes. %Y A132933 Primes whose digits are primes: A019546. Cf. A007908, A019518, A019546, A089933. %K A132933 base,easy,nonn %O A132933 1,1 %A A132933 _Omar E. Pol_, Sep 05 2007