The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A157807 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A157807

Numerators of fractions arranged in "antidiagonal boustrophedon" ordering with equivalent fractions removed: (1/1, 2/1, 1/2, 1/3, 3/1, 4/1, 3/2, 2/3, 1/4, 1/5, 5/1, 6/1, 5/2, ...).
(history; published version)

#28 by Peter Luschny at Tue Oct 10 14:02:19 EDT 2023

STATUS

editing

approved

#27 by Peter Luschny at Tue Oct 10 14:01:42 EDT 2023

EXTENSIONS

Name corrected by _Peter Luschny_ and _Andrey Zabolotskiy_, Oct 10 2023

STATUS

proposed

editing

Discussion

Tue Oct 10

14:02

Peter Luschny: That's OK!

#26 by Andrey Zabolotskiy at Tue Oct 10 12:23:07 EDT 2023

STATUS

editing

proposed

#25 by Andrey Zabolotskiy at Tue Oct 10 12:22:19 EDT 2023

NAME

Numerators of fractions arranged (1/1, 2/1, 1/2, 1/3, 3/1, 4/1, 3/2, 2/3, 1/4, 1/5, 5/1, 6/1, 5/2, ...) in "antidiagonal boustrophedon" ordering with equivalent fractions removed: (1/1, 2/1, 1/2, 1/3, 3/1, 4/1, 3/2, 2/3, 1/4, 1/5, 5/1, 6/1, 5/2, ...).

EXTENSIONS

Misleading name Name corrected by Peter Luschny, and _Andrey Zabolotskiy_, Oct 10 2023

STATUS

proposed

editing

Discussion

Tue Oct 10

12:23

Andrey Zabolotskiy: Thank you. OK like this?

#24 by Peter Luschny at Tue Oct 10 03:58:25 EDT 2023

STATUS

editing

proposed

Discussion

Tue Oct 10

07:21

Andrey Zabolotskiy: Maybe name this ordering by a different name in the Name, just to make it easier to understand what's going on? Smth like "antidiagonal boustrophedon".

11:43

Peter Luschny: If you think that helps, please enter it.

#23 by Peter Luschny at Tue Oct 10 03:56:21 EDT 2023

NAME

Numerators of fractions arranged in Cantor's ordering (1/1, 2/1, 1/2, 1/3, 3/1, 4/1, 3/2, 2/3, 1/4, 1/5, 5/1, 6/1, 5/2, ...) with equivalent fractions removed.

CROSSREFS

With Cantor's ordering: A020652, A020653, A352911.

EXTENSIONS

Misleading name corrected by Peter Luschny, Oct 10 2023

STATUS

approved

editing

#22 by Michael De Vlieger at Mon Oct 09 17:07:14 EDT 2023

STATUS

proposed

approved

#21 by Peter Luschny at Mon Oct 09 16:39:06 EDT 2023

STATUS

editing

proposed

#20 by Peter Luschny at Mon Oct 09 16:30:38 EDT 2023

PROG

from fractions math import gcd

.. for i in range(1, s):

.... if gcd(i, s - i) != 1: continue

.... print(i)

.. for i in range(s, 0, -1):

.... if gcd(i, s + 1 - i) != 1: continue

.... print(i)

STATUS

approved

editing

Discussion

Mon Oct 09

16:30

Peter Luschny: Python updated.

#19 by OEIS Server at Mon Oct 09 12:10:07 EDT 2023

LINKS

Robert Israel, <a href="/A157807/b157807_1.txt">Table of n, a(n) for n = 1..10000</a>