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 A157868 #5 Mar 31 2012 10:26:07 %S A157868 2,3,5,7,11,101,131,151,191,313,353,383,727,797,929,10301,10501,11311, %T A157868 12821,13331,13831,15451,16061,16661,17471,17971,19391,19991,30103, %U A157868 30803,32423,35053,35753,36263,36563,37573,38183,38783,70207,70607 %N A157868 Palindromic primes with prime digital roots. %Y A157868 A002385, A078403 %K A157868 nonn,base %O A157868 1,1 %A A157868 _Lekraj Beedassy_, Mar 08 2009 %E A157868 Corrected and extended by _Ray Chandler_, Mar 12 2009