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A175007
Positions of nonnegative terms in A131389.
1
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
1,2
COMMENTS
Is a(n+1)-a(n) always 1,2 or 3?
EXAMPLE
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
Sequence in context: A026461 A026168 A286402 * A284685 A113238 A104214
KEYWORD
nonn
AUTHOR
Clark Kimberling, Apr 03 2010
STATUS
approved