A131391 Positions of positive integers in A131389, minus 1.

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.

Links

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

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.

Crossrefs

Cf. A131388, A131389, A131390, A131392, A131393, A131394, A131395, A131396, A131397.

Sequence in context: A160545 A161790 A131396 * A185392 A324700 A191987

Adjacent sequences: A131388 A131389 A131390 * A131392 A131393 A131394

Keyword

nonn

Author

Clark Kimberling, Jul 06 2007

Status

approved