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 A274792 #28 Jul 27 2016 22:33:02 %S A274792 3,5,5,663569,3031329797,17479880417,1855418882807417,2640138520272677 %N A274792 a(n) = smallest prime p(1) in a symmetrical constellation of n consecutive twin primes: p(1), p(1)+2, ..., p(n), p(n)+2. %H A274792 N. Makarova and C. Rivera, <a href="http://www.primepuzzles.net/puzzles/puzz_813.htm">Symmetrical compositions of consecutive twin primes</a>. %e A274792 The list of two consecutive twin primes (5, 7, 11, 13) is symmetrical because 5+13 = 7+11. Thus a(2) = 5. %e A274792 The list of three consecutive twin primes (5, 7, 11, 13, 17, 19) is symmetrical because 5+19 = 7+17 = 11+13. Thus a(3) = 5. %Y A274792 Cf. A077800. %K A274792 nonn,more %O A274792 1,1 %A A274792 _Natalia Makarova_, Jul 07 2016 %E A274792 a(7)-a(8) from _Dmitry Petukhov_, Jul 07 2016