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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 * A356617 A086519 A090689 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 May 22 17:27 EDT 2024. Contains 372758 sequences. (Running on oeis4.)