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A089960 Positions in A089959 where 4 occurs. 1
1, 4, 6, 7, 9, 12, 14, 17, 20, 22, 25, 27, 28, 30, 33, 35, 38, 40, 41, 43, 46, 48, 49, 51, 54, 56, 59, 61, 62, 64, 67, 69, 72, 75, 77, 80, 82, 83, 85, 88, 90, 93, 95, 96, 98, 101, 103, 106, 109, 111, 114, 116, 117, 119, 122, 124, 127, 130, 132, 135, 137, 138, 140, 143, 145, 148, 150, 151, 153, 156, 158 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(n)/n tends to 2.

LINKS

Table of n, a(n) for n=1..71.

FORMULA

n = the set of natural numbers generating "4" using the formula of A089959: floor( 1/({n*k}*(1 - {n*k}) where k = .6180339... = phi^(-1).; {x} = fractional part.

EXAMPLE

a(5) = 9 since A089959(9) = 4.

CROSSREFS

Cf. A089959.

Sequence in context: A177688 A190250 A047508 * A067888 A189142 A043337

Adjacent sequences:  A089957 A089958 A089959 * A089961 A089962 A089963

KEYWORD

nonn

AUTHOR

Gary W. Adamson, Nov 16 2003

STATUS

approved

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Last modified November 13 10:29 EST 2019. Contains 329093 sequences. (Running on oeis4.)