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A282024 Define k by A280864(k) = 2^n; then a(n) = A280864(k-1)/2, or -1 if that is not an integer. 1
1, 3, 7, 19, 41, 74, 131, 302, 523, 1031, 2458, 4132, 8209, 16381, 32832, 84614, 131101, 262139 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

COMMENTS

It is known that every even number appears in A280864, and that the powers of 2 appear in increasing order.

If it were known that A280864(k-1) were always even, this would prove that A280864 contains every odd number, and so complete the proof that A280864 contains every positive number.

LINKS

Table of n, a(n) for n=2..19.

CROSSREFS

Cf. A280864, A280746.

Sequence in context: A173114 A163572 A292775 * A086519 A090689 A145476

Adjacent sequences:  A282021 A282022 A282023 * A282025 A282026 A282027

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Feb 10 2017

STATUS

approved

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Last modified February 19 21:04 EST 2019. Contains 320328 sequences. (Running on oeis4.)