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(2*n)-th twin prime minus 2*(n-th twin prime).
0

%I #3 Mar 30 2012 18:52:39

%S -1,1,3,7,15,25,33,43,45,55,63,61,69,55,81,37,63,67,93,73,141,133,159,

%T 163,207,217,231,247,261,355,363,349,375,343,477,469,483,439,465,457,

%U 531,439,447,439,453,505,525,439,441,469,477,469

%N (2*n)-th twin prime minus 2*(n-th twin prime).

%F a(n)=A001097(2n)-2*A001097(n).

%e a(1)=-1 because A001097(2*1)-2*A001097(1)=5-2*3=-1.

%Y Cf. A066066.

%K sign

%O 1,3

%A _Juri-Stepan Gerasimov_, Jun 02 2010