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 A083997 #5 Dec 05 2013 19:56:16 %S A083997 313,93139,3931393,11393139311,1113931393111,23111393139311123, %T A083997 492311139313931112349,2149231113931393111234921, %U A083997 321492311139313931112349213,1732149231113931393111234921317 %N A083997 Primes arising in A083996. %Y A083997 Cf. A083996, A083998, A083999, A084000, A083401. %K A083997 base,nonn %O A083997 1,1 %A A083997 _Amarnath Murthy_, May 23 2003 %E A083997 More terms from _Ray Chandler_, Jun 22 2003