The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A363900 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A363900

Expansion of Sum_{k>0} k * x^(4*k) / (1 - x^(5*k)).
(history; published version)

#18 by OEIS Server at Thu Jun 29 11:22:43 EDT 2023

LINKS

Seiichi Manyama, <a href="/A363900/b363900_1.txt">Table of n, a(n) for n = 1..10000</a>

#17 by Alois P. Heinz at Thu Jun 29 11:22:43 EDT 2023

STATUS

proposed

approved

Discussion

Thu Jun 29

11:22

OEIS Server: Installed first b-file as b363900.txt.

#16 by Seiichi Manyama at Thu Jun 29 11:20:56 EDT 2023

STATUS

editing

proposed

#15 by Seiichi Manyama at Thu Jun 29 11:12:28 EDT 2023

LINKS

Seiichi Manyama, <a href="/A363900/b363900_1.txt">Table of n, a(n) for n = 1..10000</a>

#14 by Seiichi Manyama at Thu Jun 29 10:59:43 EDT 2023

FORMULA

G.f.: Sum_{k>0} x^(5*k-1) / (1 - x^(5*k-1))^2.

STATUS

approved

editing

#13 by Michael De Vlieger at Tue Jun 27 10:26:40 EDT 2023

STATUS

reviewed

approved

#12 by Michel Marcus at Tue Jun 27 09:18:11 EDT 2023

STATUS

proposed

reviewed

#11 by Amiram Eldar at Tue Jun 27 07:36:06 EDT 2023

STATUS

editing

proposed

#10 by Amiram Eldar at Tue Jun 27 07:36:04 EDT 2023

MATHEMATICA

a[n_] := DivisorSum[n, # &, Mod[n/#, 5] == 4 &]; Array[a, 100] (* Amiram Eldar, Jun 27 2023 *)

STATUS

proposed

editing

#9 by Seiichi Manyama at Tue Jun 27 07:03:10 EDT 2023

STATUS

editing

proposed