A338347 a(n) = index k such that A338338(k) = n, or -1 if n does not appear in A338338.

1, 2, 5, 3, 7, 4, 11, 10, 6, 8, 19, 14, 33, 12, 15, 18, 38, 22, 42, 9, 23, 20, 54, 26, 68, 32, 27, 13, 73, 16, 78, 37, 28, 39, 60, 35, 82, 41, 34, 17, 91, 24, 95, 21, 44, 53, 120, 36, 90, 31, 49, 64, 125, 56, 29, 25, 43, 72, 145, 45, 152, 79, 48, 81, 69, 57, 157, 40, 55, 46

Offset

1,2

Comments

There is a strong conjecture that A338338 is a permutation of the positive integers. If that is true, this is the inverse permutation.

Links

Rémy Sigrist, Table of n, a(n) for n = 1..10000

Rémy Sigrist, PARI program for A338347

Prog

(PARI) See Links section.

Crossrefs

Cf. A338338-A338349.

Sequence in context: A354575 A257983 A210770 * A227688 A358923 A328827

Adjacent sequences: A338344 A338345 A338346 * A338348 A338349 A338350

Keyword

nonn

Author

N. J. A. Sloane, Oct 27 2020

Status

approved