The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A054720

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A054720

Number of 5-ary sequences with primitive period n.
(history; published version)

#17 by N. J. A. Sloane at Wed Apr 14 22:25:24 EDT 2021

STATUS

proposed

approved

#16 by Ilya Gutkovskiy at Wed Apr 14 21:48:49 EDT 2021

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editing

proposed

#15 by Ilya Gutkovskiy at Wed Apr 14 21:42:20 EDT 2021

FORMULA

G.f.: 1 + 5 * Sum_{k>=1} mu(k) * x^k / (1 - 5*x^k). - Ilya Gutkovskiy, Apr 14 2021

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approved

editing

#14 by Alois P. Heinz at Thu Dec 11 04:14:10 EST 2014

STATUS

editing

approved

#13 by Alois P. Heinz at Thu Dec 11 04:14:07 EST 2014

MAPLE

seq (a(n), n=0..30); # Alois P. Heinz, Oct 21 2012

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approved

editing

#12 by Bruno Berselli at Tue Mar 11 09:36:44 EDT 2014

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proposed

approved

#11 by Jean-Fran�ois Alcover at Tue Mar 11 09:33:17 EDT 2014

STATUS

editing

proposed

#10 by Jean-Fran�ois Alcover at Tue Mar 11 09:33:08 EDT 2014

MATHEMATICA

a[0] = 1; a[n_] := Sum[MoebiusMu[d]*5^(n/d), {d, Divisors[n]}]; Table[a[n], {n, 0, 23}] (* Jean-Fran�ois Alcover, Mar 11 2014 *)

STATUS

approved

editing

#9 by Alois P. Heinz at Sun Oct 21 12:04:06 EDT 2012

STATUS

editing

approved

#8 by Alois P. Heinz at Sun Oct 21 12:03:52 EDT 2012

LINKS

Alois P. Heinz, <a href="/A054720/b054720.txt">Table of n, a(n) for n = 0..450</a>