The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A364094 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A364094

Sum of divisors of 5*n-3 of form 5*k+1.
(history; published version)

#15 by Joerg Arndt at Mon Jul 17 00:59:44 EDT 2023

STATUS

reviewed

approved

#14 by Michel Marcus at Mon Jul 17 00:40:13 EDT 2023

STATUS

proposed

reviewed

#13 by Amiram Eldar at Mon Jul 17 00:13:59 EDT 2023

STATUS

editing

proposed

#12 by Amiram Eldar at Mon Jul 17 00:07:43 EDT 2023

MATHEMATICA

a[n_] := DivisorSum[5*n - 3, # &, Mod[#, 5] == 1 &]; Array[a, 100] (* Amiram Eldar, Jul 17 2023 *)

STATUS

approved

editing

#11 by Michael De Vlieger at Wed Jul 05 08:24:30 EDT 2023

STATUS

reviewed

approved

#10 by Joerg Arndt at Wed Jul 05 04:21:22 EDT 2023

STATUS

proposed

reviewed

#9 by Seiichi Manyama at Wed Jul 05 04:18:56 EDT 2023

STATUS

editing

proposed

#8 by Seiichi Manyama at Tue Jul 04 23:06:45 EDT 2023

CROSSREFS

Cf. A284097, A359237, A364098.

#7 by Seiichi Manyama at Tue Jul 04 22:58:08 EDT 2023

FORMULA

G.f.: Sum_{k>0} (5*k-4) * x^(2*k-1) / (1 - x^(5*k-4)).

#6 by Seiichi Manyama at Tue Jul 04 22:50:36 EDT 2023

CROSSREFS

Cf. A284097, A364098.