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%I #6 Oct 12 2013 15:24:51
%S 4,-4,2,-2,0,2,0,2,2,-2,-2,0,0,2,-2,-2,0,0,2,2,-2,0,2,2,2,0,0,-2,2,0,
%T 0,2,-2,-2,2,0,2,0,2,2,2,0,-2,0,2,0,-2,2,2,-2,-2,0,-2,-2,2,-2,2,-2,2,
%U 0,-2,-2,2,-2,2,0,2,-2,-2,0,0,2,0,2,-2,-2,2,0,0,2,0,0,0,-2,2,-2,0,0,0,2,0,2,-2,-2,0,-2,2,2,-2,2,2,-2,0,2,0,0,2,-2,-2,-2,0
%N Average of twin-prime pairs modulo 10 (least absolute residue).
%C All terms after a(2) are 0, 2, or -2. - _Franklin T. Adams-Watters_, Aug 27 2012
%e First twin-prime average = (3+5)/2 = 4: a(1) = +4.
%e Second twin-prime average = (5+7)/2 = 6 (= -4+1*10): a(2) = -4.
%e Third twin-prime average = (11+13)/2 = 12 (= 2+1*10): a(3) = +2.
%Y Cf. A014574.
%K sign
%O 1,1
%A _Greg Huber_, Jul 18 2006
%E Edited by _Franklin T. Adams-Watters_, Aug 27 2012
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