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 A165888 #2 Mar 30 2012 17:26:30 %S A165888 5,13,31,61,103,139,157,181,211,277,349,373,409,463,547,613,631,691, %T A165888 811,937,1021,1069,1129,1201,1279,1399,1549,1663,1723,1753,1873,1993, %U A165888 2089,2281,2467,2617,2707,2749,2917,3163,3301,3457,3607,3691,3793,3877,3919 %N A165888 Primes arising in A126938. %F A165888 a(n)=(A126938(n)+A126938(n+1))/2. %Y A165888 Cf. A126938. %K A165888 nonn %O A165888 1,1 %A A165888 _Zak Seidov_, Sep 29 2009