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 A178581 #2 Mar 31 2012 10:26:16 %S A178581 11311,12721,13831,14741,16061,16561,17471,18481,20507,21107,21407, %T A178581 21617,21817,22727,23027,23227,23327,23537,24137,24547,24847,25147, %U A178581 25247,25447,25657,26357,27067,27367,28277,34543,34843,35153,35353 %N A178581 Primes that are the average of the members of emirp pairs. %C A178581 For the lesser member of the corresponding smallest emirp pair, see A178582. %Y A178581 Cf. A006567, A109308, A109309 %K A178581 nonn,base %O A178581 1,1 %A A178581 _Lekraj Beedassy_, May 29 2010