The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A090252 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A090252

The Two-Up sequence: a(n) is the least positive number not already used that is coprime to the previous floor(n/2) terms.
(history; published version)

#133 by N. J. A. Sloane at Sun Aug 11 23:41:01 EDT 2024

STATUS

proposed

approved

#132 by Bill McEachen at Fri Aug 09 08:45:02 EDT 2024

STATUS

editing

proposed

#131 by Bill McEachen at Fri Aug 09 08:44:02 EDT 2024

COMMENTS

If we consider the May 23 2022 comment, note the conjectured indices show near complete overlap with terms of A081026: 1, 2, 3, 5, 6, 11, 23, 47, 95, 191, 383, 767, 1535, 3071, 6143, 8191. - Bill McEachen, Aug 09 2024

STATUS

approved

editing

Discussion

Fri Aug 09

08:44

Bill McEachen: An editor suggested moving comment from A081026 ...

#130 by Michael De Vlieger at Wed Nov 29 13:07:54 EST 2023

STATUS

proposed

approved

#129 by Michel Marcus at Wed Nov 29 12:06:05 EST 2023

STATUS

editing

proposed

#128 by Michel Marcus at Wed Nov 29 12:05:53 EST 2023

LINKS

Michael De Vlieger, Thomas Scheuerle, Rémy Sigrist, N. J. A. Sloane, and Walter Trump, <a href="http://arxiv.org/abs/2209.04108">The Binary Two-Up Sequence</a>, arXiv:2209.04108, [math.CO], Sep 11 2022.

STATUS

approved

editing

#127 by Michael De Vlieger at Sat Jan 07 09:43:39 EST 2023

STATUS

reviewed

approved

#126 by Joerg Arndt at Sat Jan 07 05:38:06 EST 2023

STATUS

proposed

reviewed

#125 by Robert C. Lyons at Sat Jan 07 05:21:34 EST 2023

STATUS

editing

proposed

#124 by Robert C. Lyons at Sat Jan 07 05:21:21 EST 2023

CROSSREFS

For a square-free squarefree analog, see A354790, A354791, A354792.

STATUS

proposed

editing