A059983 First occurrence of n in A007599.

1, 0, 6, 7, 8, 9, 12, 13, 14, 15, 18, 19, 22, 23, 24, 25, 28, 29, 32, 33, 36, 37, 40, 41, 42, 43, 46, 47, 50, 51, 54, 55, 58, 59, 62, 63, 66, 67, 70, 71, 74, 75, 76, 77, 80, 81, 84, 85, 88, 89, 92, 93, 96, 97, 100, 101, 104, 105, 108, 109, 112, 113, 116, 117, 120, 121, 124

Offset

0,3

Links

Reinhard Zumkeller, Table of n, a(n) for n = 0..10000

Example

a(5) does not appear in A007599 until the 9th entry, keeping in mind the offset.

Mathematica

a[n_Integer] := a[n] = (a[n - 1] + Nest[a, n - 2, Floor[n/2] ] ); a[0] = 1; a[1] = 0; b[n_Integer] := (k = 0; While[ a[k] != n, k++ ]; k); Table[ b[n], {n, 0, 75} ]

Prog

(Haskell)
import Data.List (elemIndex)
import Data.Maybe (mapMaybe)
a059983 n = a059983_list !! n
a059983_list = mapMaybe (`elemIndex` a007599_list) [0..]
-- Reinhard Zumkeller, Jan 05 2012

Crossrefs

Cf. A007599.

Sequence in context: A309265 A309404 A120191 * A177106 A269101 A037366

Adjacent sequences: A059980 A059981 A059982 * A059984 A059985 A059986

Keyword

nonn

Author

Robert G. Wilson v, Mar 07 2001

Status

approved