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 A077499 #8 Dec 05 2013 19:55:53 %S A077499 2,3,5,17,23,89,257,353,1409,2663,30977,65537,170369,495617,5767169, %T A077499 23068673,59969537,82458113,453519617,3429742097,4715895383, %U A077499 15352201217,39909726209,1857616347137,45732811767809,96757023244289 %N A077499 Primes of the form 2^r*11^s + 1. %C A077499 Primes p such that p-1 has at most one odd prime divisor 11. %Y A077499 Cf. A005109, A077497, A077498, A077500. %K A077499 nonn %O A077499 1,1 %A A077499 _Amarnath Murthy_, Nov 07 2002 %E A077499 More terms from _Ray Chandler_, Aug 02 2003