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Numerator of 1/pp(n) - 1/pp(n+1), where pp(n) = n-th prime power.
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%I #5 Mar 30 2012 17:26:03

%S 3,1,1,7,9,2,5,1,13,15,17,19,21,4,3,1,25,27,5,1,2,13,33,35,19,18,39,

%T 41,43,7,17,47,49,51,53,55,57,59,61,39,3,65,67,69,71,35,38,75,77,79,

%U 81,47,1,85,87,89,23,17,71,10,12,95,97,99,101,103,5,65,107,109,4,11,113,115

%N Numerator of 1/pp(n) - 1/pp(n+1), where pp(n) = n-th prime power.

%e a(2) = 1 because 1/pp(3) - 1/pp(2) = 1/4 - 1/8 =1/2.

%K easy,nonn,frac

%O 1,1

%A _Zak Seidov_, Oct 11 2002