A175007 Positions of nonnegative terms in A131389.

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, 48, 50, 52, 54, 57, 58, 60, 62, 64, 66, 69, 70, 73, 74, 76, 78, 80, 82, 84, 86, 89, 91, 93, 95, 96, 98, 100, 102, 104, 106, 109, 110, 112, 114, 116, 118, 120, 122, 124, 126, 128

Offset: 1

Author

Clark Kimberling, Apr 03 2010

Keywords

• nonn

Comments

Is a(n+1)-a(n) always 1,2 or 3?

Examples

			The first 20 terms of A131389 are
0,1,2,-1,3,4,-2,-3,6,-4,5,7,-5,8,-6,-7,9,10,-8,11.
Positions occupied by nonnegatives are
1,2,3,5,6,9,11,12,14,17,18,20.
		

Crossrefs

Cf. A131389, A175008.