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 A087607 #5 Feb 28 2014 05:22:26 %S A087607 19,229,0,11119,111119,0,11111119,11111111111111119,0, %T A087607 646464646464646464649,555555555559,0,22222222222229, %U A087607 31313131313131313131313131319,0,11111111111111119,555555555555555559,0,101010101010101010101010101010101010109 %N A087607 Primes arising in A087606, or 0 if A087606(k) = 0. %Y A087607 Cf. A086920, A087604, A087605, A087606, A087608, A087609, A087610. %K A087607 base,nonn %O A087607 1,1 %A A087607 _Amarnath Murthy_, Sep 18 2003 %E A087607 More terms from _Michel Marcus_, Feb 28 2014