%I #14 Aug 03 2014 14:01:35
%S 1,1,2,0,1,1,1,1,2,0,2,1,2,1,2,1,1,1,0,2,1,1,1,3,1,0,1,3,1,0,3,2,1,1,
%T 4,0,2,2,2,2,2,2,2,2,5,1,3,1,0,2,4,2,0,2,2,3,4,3,3,2,2,4,4,5,1,4,2,3,
%U 2,3,1,1,5,3,2,2,2,3,2,2,6,4,1,2,3,4
%N Number of twin prime numbers of the form n*(n+1) + 2*k-3 and n*(n+1) + 2*k-1 with k = 1 to n+1.
%C 0.66*n/log(n)^2 is a good approximation for a(n) as n increases
%H Pierre CAMI, <a href="/A199322/b199322.txt">Table of n, a(n) for n = 1..10000</a>
%t Table[m = n*(n+1); Length[Select[Range[n+1], PrimeQ[m + 2*#-3] && PrimeQ[m + 2*#-1] &]], {n, 100}] (* _T. D. Noe_, Nov 07 2011 *)
%Y Cf. A199323, A199324.
%K nonn
%O 1,3
%A _Pierre CAMI_, Nov 07 2011