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A131391
Positions of positive integers in A131389, minus 1.
9
1, 2, 4, 5, 8, 10, 11, 13, 16, 17, 19, 21, 24, 25, 28, 29, 32, 33, 35, 37, 39, 41, 44, 46, 47, 49, 51, 53, 56, 57, 59, 61, 63, 65, 68, 69, 72, 73, 75, 77, 79, 81, 83, 85, 88, 90, 92, 94, 95, 97, 99, 101, 103, 105, 108, 109, 111, 113, 115, 117, 119, 121, 123, 125, 127, 129
OFFSET
1,2
COMMENTS
If A131389 is a permutation of the integers, as conjectured, then A131391 is the complement of A131392.
FORMULA
a(n) = -1 + position of the n-th positive integer in the sequence A131389=(0,1,2,-1,3,4,-2,-3,6,-4,5,...)
EXAMPLE
The 5th positive integer to occur in A131391 is 6, which occurs in position 9, so that a(5) = 9 - 1 = 8.
KEYWORD
nonn
AUTHOR
Clark Kimberling, Jul 06 2007
STATUS
approved