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%I #3 Mar 31 2012 13:22:05
%S 2,0,3,16,75,495,3440,25185
%N a(n) = number of primes that are the initial prime of a twin prime pair that are > (10^n)*(10^n+1) and < (10^n)*(10^n+1)+2*(10^n)+2.
%e 3 and 5 are twin primes as are 5 and 7, 3 and 5 > 2 and < 6 so a(0)=2
%K hard,nonn
%O 0,1
%A _Pierre CAMI_, Dec 13 2007
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