A175007 - OEIS

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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

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

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

LINKS

Table of n, a(n) for n=1..66.

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.