The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A127202 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A127202

a(1)=1, a(2)=2; a(n) = the smallest positive integer not occurring earlier in the sequence such that gcd(a(n), a(n-1)) does not equal gcd(a(n-1), a(n-2)).
(history; published version)

#65 by Jon E. Schoenfield at Sat Jan 22 23:36:49 EST 2022

STATUS

proposed

approved

#64 by Jon E. Schoenfield at Sat Jan 22 23:17:30 EST 2022

STATUS

editing

proposed

#63 by Jon E. Schoenfield at Sat Jan 22 23:17:27 EST 2022

COMMENTS

Comment from N. J. A. Sloane, Feb 28 2017 : (Start):

STATUS

approved

editing

#62 by Alois P. Heinz at Sun Aug 22 13:52:42 EDT 2021

STATUS

proposed

approved

#61 by Michel Marcus at Sun Aug 22 13:25:19 EDT 2021

STATUS

editing

proposed

#60 by Michel Marcus at Sun Aug 22 13:25:13 EDT 2021

PROG

(PARI/GP, ) \\ based on Rémy Sigrist's program for A280985)

quit

STATUS

proposed

editing

#59 by Jon E. Schoenfield at Sun Aug 22 13:24:05 EDT 2021

STATUS

editing

proposed

#58 by Jon E. Schoenfield at Sun Aug 22 13:23:46 EDT 2021

PROG

(PARI-/GP, based on Rémy Sigrist's program for A280985)

STATUS

approved

editing

Discussion

Sun Aug 22

13:24

Jon E. Schoenfield: "PARI/GP"? or "PARI"?

#57 by N. J. A. Sloane at Wed Dec 09 02:18:21 EST 2020

STATUS

editing

approved

#56 by N. J. A. Sloane at Wed Dec 09 02:18:19 EST 2020

LINKS

Dana G. Korssjoen, Biyao Li, Stefan Steinerberger, Raghavendra Tripathi, and Ruimin Zhang, <a href="https://arxiv.org/abs/2012.04625">Finding structure in sequences of real numbers via graph theory: a problem list</a>, arXiv:2012.04625, Dec 08, 2020

STATUS

approved

editing