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 A086526 #6 Dec 05 2013 19:56:19 %S A086526 2,4,6,8,14,12,10,16,18,20,26,32,30,28,34,24,22,36,38,44,42,40,46,48, %T A086526 58,60,62,56,50,68,54,52,66,76,70,64,78,80,86,72,74,84,82,96,98,104, %U A086526 90,88,106,100,94,108,110,92,102,112,114,140,122,132,130,124,138,116,146,128 %N A086526 Beginning with 2, the smallest even number not included earlier such that the arithmetic mean of a pair of successive terms is a prime. %C A086526 A rearrangement of even numbers. %F A086526 a(n) = 2 * A055265(n). %Y A086526 Cf. A086527. %K A086526 nonn %O A086526 1,1 %A A086526 _Amarnath Murthy_, Jul 31 2003 %E A086526 More terms from _David Wasserman_, Mar 14 2005