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%I #4 Mar 30 2012 18:36:32
%S 9,17,23,25,31,42,53,63,69,71,77,84,91,102,109,112,119,127,135,145,
%T 153,157,162,172,181,185,188,194,200,204,211,222,232,239,241,243,253,
%U 258,268,279,280,288
%N Sums of adjacent terms of A073159. Together, A073158, A073159 and A073160 include all the positive integers uniquely.
%C a(n) is asymptotic to 7n.
%F a(n) = A073159(n) + A073159(n-1), where A073159(0)=0.
%e A073158:_1,2,4, 7, 5, 8,10,14,15,19,16,20,21,22,26,28,27,... A073159:__3,6,11,12,13,18,24,29,34,35,36,41,43,48,54,55,... A073160:___9,17,23,25,31,42,53,63,69,71,77,84,91,102,109,...
%Y Cf. A073158, A073159.
%K easy,nonn
%O 1,1
%A _Paul D. Hanna_, Jul 29 2002
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