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 A089567 #5 Jan 04 2013 16:26:09 %S A089567 11,211,4211,34211,534211,9534211,19534211,3019534211,63019534211, %T A089567 2063019534211,162063019534211,8162063019534211,248162063019534211, %U A089567 15248162063019534211,1315248162063019534211,391315248162063019534211 %N A089567 Primes arising in A089566. %Y A089567 Cf. A089710, A089711, A089560-A089573. %K A089567 nonn,base %O A089567 1,1 %A A089567 _Ray Chandler_, Nov 22 2003