A256618 Index i such that A121217(i) = n, or 0 if no such i exists.

1, 2, 3, 4, 10, 5, 13, 6, 7, 8, 21, 9, 26, 11, 12, 16, 34, 14, 35, 18, 15, 19, 47, 17, 20, 24, 25, 29, 54, 22, 61, 31, 23, 32, 40, 27, 68, 33, 28, 41, 77, 30, 82, 43, 38, 45, 91, 39, 42, 46, 36, 48, 100, 50, 53, 44, 37, 52, 109, 51, 118, 59, 58, 62, 55, 60

Offset

1,2

Comments

If A121217 is a permutation, as conjectured, then this is the inverse permutation.

Links

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Prog

(Haskell)
import Data.List (elemIndex); import Data.Maybe (fromJust)
a256618 = (+ 1) . fromJust . (`elemIndex` a121217_list)

Crossrefs

Cf. A121217.

Sequence in context: A265348 A158929 A255479 * A140598 A129920 A356332

Adjacent sequences: A256615 A256616 A256617 * A256619 A256620 A256621

Keyword

nonn

Author

Reinhard Zumkeller, Apr 05 2015

Status

approved