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 A212294 #10 Jun 22 2012 15:44:38 %S A212294 0,3,5,7,8,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28, %T A212294 29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51, %U A212294 52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74 %N A212294 Sums of (zero or more) distinct twin primes. %C A212294 Assuming a Bertrand-like result for twin primes, that for every n > 3 there is a prime n < p < 2n such that either p-2 or p+2 is prime, the only missing terms are 1, 2, 4, 6, and 9. %F A212294 Conjecturally, a(n) = n+4 for n > 5. This holds at least up to 2^500. %Y A212294 Cf. A208572. %K A212294 nonn %O A212294 1,2 %A A212294 _Charles R Greathouse IV_, Jun 21 2012