%I
%S 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 20,20,20,21,21,21,21,21,21,21,21,21,21,23,23,23,23,24,24,24,24,24,24,
%U 24,25,25,25,25,26,26,26,27,27,28,29,29,30,30,30,30,30,30,30,30,30,30
%N The count of lessertwinprimes smaller than the nth isolated prime.
%C The count of members of A001359 smaller than A007510(n).
%e a(1)=0 because there is no twin prime smaller than 2.
%e a(2)= 4 counts the numbers 3, 5, 11, and 17 all smaller than 23.
%e a(3) = 5 counts the numbers 3, 5, 11, 17, and 29 all smaller than 37.
%Y Cf. A000040, A141468, A073425.
%K nonn
%O 1,2
%A _JuriStepan Gerasimov_, Jul 01 2009
%E Entried checked by _R. J. Mathar_, Sep 23 2009
