The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A294887

(Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A294887

Sum of nondeficient proper divisors of n.
(history; published version)

#14 by Michel Marcus at Thu Mar 14 03:48:41 EDT 2024

STATUS

reviewed

approved

#13 by Joerg Arndt at Thu Mar 14 02:14:14 EDT 2024

STATUS

proposed

reviewed

#12 by Amiram Eldar at Thu Mar 14 01:24:48 EDT 2024

STATUS

editing

proposed

#11 by Amiram Eldar at Thu Mar 14 01:10:07 EDT 2024

LINKS

<a href="/index/Su#sums_of_divisors">Index entries for sequences related to sums of divisors</a>.

MATHEMATICA

a[n_] := DivisorSum[n, # &, # < n && DivisorSigma[1, #] >= 2*# &]; Array[a, 100] (* Amiram Eldar, Mar 14 2024 *)

STATUS

approved

editing

#10 by Michael De Vlieger at Mon Apr 04 15:25:32 EDT 2022

STATUS

proposed

approved

#9 by Antti Karttunen at Mon Apr 04 11:12:17 EDT 2022

STATUS

editing

proposed

#8 by Antti Karttunen at Mon Apr 04 11:11:30 EDT 2022

FORMULA

a(n) = Sum_{d|n, d<n} A294935A294936(d)*d. - Typo in A-number corrected by _Antti Karttunen_, Apr 04 2022

STATUS

approved

editing

#7 by Susanna Cuyler at Tue Nov 14 17:37:26 EST 2017

STATUS

proposed

approved

#6 by Antti Karttunen at Tue Nov 14 15:39:45 EST 2017

STATUS

editing

proposed

#5 by Antti Karttunen at Tue Nov 14 15:32:13 EST 2017

LINKS

Antti Karttunen, <a href="/A294887/b294887.txt">Table of n, a(n) for n = 1..20000</a>