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A283481 Positions of odd terms in A004001. 4
1, 2, 5, 9, 11, 12, 17, 19, 22, 25, 26, 27, 33, 35, 37, 38, 40, 43, 46, 47, 48, 50, 51, 55, 56, 57, 58, 65, 67, 69, 72, 74, 77, 79, 80, 82, 83, 87, 89, 90, 92, 93, 97, 100, 101, 102, 107, 110, 111, 112, 117, 118, 119, 120, 121, 129, 131, 133, 135, 136, 138, 140, 143, 145, 148, 150, 151, 153, 154, 158, 160, 163, 165, 166, 168, 169 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..8121

FORMULA

Other identities. For all n >= 1:

A283480(a(n)) = n.

MATHEMATICA

a[n_] := a[n] = If[n <= 2, 1, a[a[n - 1]] + a[n - a[n - 1]]]; Select[Range@ 169, OddQ@ a[#] &] (* Michael De Vlieger, Mar 18 2017, after Robert G. Wilson v at A004001 *)

PROG

(Scheme, with Antti Karttunen's IntSeq-library)

(define A283481 (NONZERO-POS 1 1 A095901))

CROSSREFS

Cf. A283482 (complement), A283480 (a left inverse).

Positions of ones in A095901.

Cf. A004001.

Sequence in context: A170838 A115248 A005123 * A284875 A154732 A242936

Adjacent sequences:  A283478 A283479 A283480 * A283482 A283483 A283484

KEYWORD

nonn

AUTHOR

Antti Karttunen, Mar 18 2017

STATUS

approved

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Last modified April 18 06:48 EDT 2019. Contains 322209 sequences. (Running on oeis4.)