%I A126761
%S A126761 2,1,3,1,9,3,3,3,15,5,17
%V A126761 2,1,3,1,9,-3,3,3,15,-5,17
%N A126761 {a(k)} is such that, for every positive integer n, the n-th prime = sum{1<=k<=n,
               GCD(k,n+1)=1} a(k).
%H A126761 Leroy Quet, <a href="http://www.prism-of-spirals.net/">Home Page</a> 
               (listed in lieu of email address)
%e A126761 31 is the 11th prime. So 31 = sum{1<=k<=11,GCD(k,12)=1} a(k) = a(1)+a(5)+a(7)+a(11) 
               = 2 +9 +3 +17.
%Y A126761 Sequence in context: A140966 A058036 A136179 this_sequence A090559 A098570 
               A122048
%Y A126761 Adjacent sequences: A126758 A126759 A126760 this_sequence A126762 A126763 
               A126764
%K A126761 more,sign
%O A126761 1,1
%A A126761 Leroy Quet Feb 22 2007