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%I #12 Dec 24 2014 13:39:34
%S 1,2,4,2,6,8,2,8,12,4,12,12,6,16,22,4,8,24,6,24,30,4,24,26,12,28,22,
%T 12,30,44,6,16,46,12,46,48,4,24,54,22,42,40,14,48,48,16,26,64,18,60,
%U 70,0,54,72,32,64,52,16,38,78,20,40,90,20,82,68,6,72,94,44,50,64
%N a(n) = phi(2n+1) - phi(2n), where phi is A000010.
%C a(157) = -12 is the first negative number in this sequence.
%Y Cf. A000010, A057000.
%K nonn
%O 1,2
%A _Eric Chen_, Dec 24 2014
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