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 A162310 #3 Mar 30 2012 18:52:33 %S A162310 0,4,5,6,6,7,8,8,8,8,10,10,10,12,12,12,12,15,15,16,17,17,17,18,19,19, %T A162310 20,20,20,21,21,21,21,21,21,21,21,21,21,23,23,23,23,24,24,24,24,24,24, %U A162310 24,25,25,25,25,26,26,26,27,27,28,29,29,30,30,30,30,30,30,30,30,30,30 %N A162310 The count of lesser-twin-primes smaller than the n-th isolated prime. %C A162310 The count of members of A001359 smaller than A007510(n). %e A162310 a(1)=0 because there is no twin prime smaller than 2. %e A162310 a(2)= 4 counts the numbers 3, 5, 11, and 17 all smaller than 23. %e A162310 a(3) = 5 counts the numbers 3, 5, 11, 17, and 29 all smaller than 37. %Y A162310 Cf. A000040, A141468, A073425. %K A162310 nonn %O A162310 1,2 %A A162310 _Juri-Stepan Gerasimov_, Jul 01 2009 %E A162310 Entried checked by _R. J. Mathar_, Sep 23 2009