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 A089563 #3 Mar 30 2012 17:29:13 %S A089563 7,17,317,6317,26317,2126317,102126317,9102126317,89102126317, %T A089563 3789102126317,203789102126317,25203789102126317,2925203789102126317, %U A089563 722925203789102126317,28722925203789102126317 %N A089563 Primes arising in A089562. %Y A089563 Cf. A089710, A089711, A089560-A089573. %K A089563 base,nonn %O A089563 1,1 %A A089563 _Ray Chandler_, Nov 22 2003