A361104 a(n) = k such that A361103(k-1) = n, or -1 if n never appears in A361103.

1, 2, 3, 17, 9, 4, 8, 31, 15, 7, 5, 47, 64, 6, 21, 10, 96, 20, 11, 13, 57, 38, 14, 16, 79, 37, 18, 12, 160, 28, 22, 19, 61, 24, 26, 23, 131, 52, 27, 25, 41, 33, 46, 29, 77, 45, 42, 34, 54, 59, 36, 32, 68, 72, 44, 40, 104, 82, 50, 49, 75, 111, 51, 35, 98, 143, 63, 30, 85

Offset: 1

Author

Scott R. Shannon and N. J. A. Sloane, Mar 02 2023

Keywords

• nonn

Comments

Imagine the offset of A361103 is 1, and assume it really is a permutation of the natural numbers. In tabular form, it is

..1..2..3..4..5..6..7..8..9.10.11...

..1..2..3..6.11.14.10..7..5.16..19...

Then the inverse permutation would be

..1..2..3.17..9..4..8.31.15..7..5.47...

which is the present sequence.

Examples

			A361103(16) = 4, so a(4) = 17.
		

Links

• N. J. A. Sloane, Table of n, a(n) for n = 1..2721

Crossrefs

Cf. A360519, A361102, A336957, A361103.

Extensions

Edited by N. J. A. Sloane, Mar 04 2023