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 A068220 #11 May 02 2016 09:44:36 %S A068220 9419,9421,9431,9433,9437,9439,9461,9463,62969,62971,62981,62983, %T A068220 62987,62989,63029,63031,72221,72223,72227,72229,72251,72253,72269, %U A068220 72271,392261,392263,392267,392269,392279,392281,392297,392299,495569 %N A068220 Twin primes belonging to packs of four or more twin pairs. %C A068220 A twin pack of primes contains 2 or more pairs of twin primes, between which pairs there are no other primes. 9419,9421,9431,9433,9437,9439,9461,9463 are in the sequence because they are consecutive primes which belong to more than 3 twin pairs. 137,139,149,151 are not because they belong to a pack of only 2 pairs. %C A068220 Could be called unrestricted prime octets. - _Harry J. Smith_, Dec 16 2007 %Y A068220 Cf. A001097, A035792, A069457. %K A068220 nonn %O A068220 1,1 %A A068220 _Neil Fernandez_, Mar 24 2002 %E A068220 More terms from _Harry J. Smith_, Dec 16 2007 %E A068220 Edited by _N. J. A. Sloane_, May 15 2008 at the suggestion of _R. J. Mathar_