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 A089571 #3 Mar 30 2012 17:29:13 %S A089571 17,317,6317,26317,126317,21126317,3521126317,433521126317, %T A089571 23433521126317,3423433521126317,473423433521126317, %U A089571 10473423433521126317,2610473423433521126317,42610473423433521126317 %N A089571 Primes arising in A089570. %Y A089571 Cf. A089710, A089711, A089560-A089573. %K A089571 base,nonn %O A089571 1,1 %A A089571 _Ray Chandler_, Nov 22 2003