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 A138536 #3 Mar 30 2012 18:52:52 %S A138536 3,5,7,11,19,23,29,37,43,47,53,59,67,71,79,83,97,101,103,107,127,137, %T A138536 139,149,157,167,173,179,181,191,197,223,227,239,251,257,263,269,271, %U A138536 277,283,293,311,317,331,347,349,353,359,367,373,383,389,409,419,431 %N A138536 Odd primes p_n for which A140140(n)=(p_n-1)/2, where p_n = n-th odd prime (A065091). %Y A138536 Cf. A140140, A137576, A065091, A138535. %K A138536 nonn %O A138536 1,1 %A A138536 _Vladimir Shevelev_, May 10 2008 %E A138536 Corrected and extended by _Ray Chandler_, May 19 2008