The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A337740 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A337740

Weird numbers (A006037) with an even sum of divisors that are not Zumkeller numbers (A083207).
(history; published version)

#12 by Wesley Ivan Hurt at Sat Sep 19 14:14:16 EDT 2020

STATUS

proposed

approved

#11 by Michel Marcus at Sat Sep 19 13:15:36 EDT 2020

STATUS

editing

proposed

#10 by Michel Marcus at Sat Sep 19 13:15:31 EDT 2020

COMMENTS

Non-deficient numbers (A023196) with an even sum of divisors (A000203) that are neither pseudpoperfect pseudoperfect numbers (A005835) nor Zumkeller numbers (A083207).

STATUS

approved

editing

Discussion

Sat Sep 19

13:15

Michel Marcus: typo

#9 by Vaclav Kotesovec at Fri Sep 18 04:32:27 EDT 2020

STATUS

reviewed

approved

#8 by Michel Marcus at Fri Sep 18 04:02:35 EDT 2020

STATUS

proposed

reviewed

#7 by Amiram Eldar at Fri Sep 18 03:51:34 EDT 2020

STATUS

editing

proposed

#6 by Amiram Eldar at Fri Sep 18 02:48:27 EDT 2020

LINKS

Amiram Eldar, <a href="/A337740/b337740.txt">Table of n, a(n) for n = 1..10000</a>

STATUS

approved

editing

#5 by Susanna Cuyler at Thu Sep 17 20:30:41 EDT 2020

STATUS

proposed

approved

#4 by Amiram Eldar at Thu Sep 17 16:47:35 EDT 2020

STATUS

editing

proposed

#3 by Amiram Eldar at Thu Sep 17 16:09:43 EDT 2020

EXAMPLE

73616 is a term since sigma(73616) = 147312 is even and larger than 2 * 73616 = 147232. No subset of the aliquot divisors of 73616 sum sums to 73616 or to sigma(73616)/2 = 73656.