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A175008
Positions of negative terms in A131389.
1
4, 7, 8, 10, 13, 15, 16, 19, 21, 23, 24, 27, 28, 31, 32, 35, 37, 39, 41, 43, 44, 46, 49, 51, 53, 55, 56, 59, 61, 63, 65, 67, 68, 71, 72, 75, 77, 79, 81, 83, 85, 87, 88, 90, 92, 94, 97, 99, 101, 103, 105, 107, 108, 111, 113, 115, 117, 119, 121, 123, 125, 127, 129, 132, 133
OFFSET
1,1
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 negatives are
4,7,8,10,13,15,16,19.
CROSSREFS
Sequence in context: A091158 A175553 A284684 * A336408 A286401 A084791
KEYWORD
nonn
AUTHOR
Clark Kimberling, Apr 03 2010
STATUS
approved