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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 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.)