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 A007796 #11 May 10 2015 15:43:21
%S A007796 21,53,117,1713,2319,3129,4137,4743,5953,6761,7371,8379,9789,103101,
%T A007796 109107,127113,137131,149139,157151,167163,179173,191181,197193,
%U A007796 211199,227223
%N A007796 List of pairs of primes in reverse order, starting at 1.
%H A007796 Harvey P. Dale, <a href="/A007796/b007796.txt">Table of n, a(n) for n = 1..1000</a>
%t A007796 FromDigits/@(Flatten[IntegerDigits/@Reverse[#]]&/@Partition[Join[{1}, Prime[ Range[2*30]]],2])(* _Harvey P. Dale_, May 10 2015 *)
%K A007796 nonn,base
%O A007796 1,1
%A A007796 bmoore(AT)artemis.ess.ucla.edu (William B. Moore)