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Revision History for A094759 (Underlined text is an addition; strikethrough text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A094759

Least k <= n such that n*sigma(k) = k*sigma(n), where sigma(n) is the sum of divisors of n (A000203).
(history; published version)

#35 by Susanna Cuyler at Wed Jul 10 21:25:36 EDT 2019

STATUS

proposed

approved

#34 by Michel Marcus at Wed Jul 10 15:09:48 EDT 2019

STATUS

editing

proposed

#33 by Michel Marcus at Wed Jul 10 15:09:45 EDT 2019

EXTENSIONS

Edited and extended by Don Reble and _Klaus Brockhaus_ _, May 31 2004

STATUS

proposed

editing

#32 by Antti Karttunen at Wed Jul 10 15:07:50 EDT 2019

STATUS

editing

proposed

#31 by Antti Karttunen at Wed Jul 10 13:09:00 EDT 2019

CROSSREFS

Cf. A000396 (positions of 6's), A005820 (positions of 120's).

#30 by Antti Karttunen at Wed Jul 10 13:07:06 EDT 2019

COMMENTS

a(n) is the least k which has the same abundancy index as n, that is, minimal k for which sigma(k)/k = sigma(n)/n. - Antti Karttunen, Jul 10 2019

CROSSREFS

Cf. A000203, A050972, A050973, A094757, A094758, A000203A326200.

STATUS

approved

editing

#29 by N. J. A. Sloane at Thu Oct 19 03:14:30 EDT 2017

EXTENSIONS

Edited and extended by _Don Reble (djr(AT)nk.ca) _ and Klaus Brockhaus May 31 2004

Discussion
Thu Oct 19	03:14	OEIS Server: https://oeis.org/edit/global/2703

#28 by Bruno Berselli at Thu Jul 23 04:07:33 EDT 2015

STATUS

reviewed

approved

#27 by Joerg Arndt at Thu Jul 23 02:44:14 EDT 2015

STATUS

proposed

reviewed

#26 by Jon E. Schoenfield at Wed Jul 22 02:22:59 EDT 2015

STATUS

editing

proposed

Discussion
Wed Jul 22	02:47	Michel Marcus: Well, it was not really intentional. Yes sure, Jon.

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Last modified September 1 03:07 EDT 2024. Contains 375575 sequences. (Running on oeis4.)