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%I #2 Mar 30 2012 18:57:11
%S 1,2,3,5,6,9,11,12,14,17,18,20,22,25,26,29,30,33,34,36,38,40,42,45,47,
%T 48,50,52,54,57,58,60,62,64,66,69,70,73,74,76,78,80,82,84,86,89,91,93,
%U 95,96,98,100,102,104,106,109,110,112,114,116,118,120,122,124,126,128
%N Positions of nonnegative terms in A131389.
%C Is a(n+1)-a(n) always 1,2 or 3?
%e The first 20 terms of A131389 are
%e 0,1,2,-1,3,4,-2,-3,6,-4,5,7,-5,8,-6,-7,9,10,-8,11.
%e Positions occupied by nonnegatives are
%e 1,2,3,5,6,9,11,12,14,17,18,20.
%Y Cf. A131389, A175008.
%K nonn
%O 1,2
%A _Clark Kimberling_, Apr 03 2010
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