The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A054991 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A054991

Number of prime divisors of n! - 1 (counted with multiplicity).
(history; published version)

#23 by Michael De Vlieger at Sun Mar 06 23:04:50 EST 2022

STATUS

proposed

approved

#22 by Sean A. Irvine at Sun Mar 06 22:05:17 EST 2022

STATUS

editing

proposed

#21 by Sean A. Irvine at Sun Mar 06 22:05:14 EST 2022

CROSSREFS

Cf. A033312, A054988, A054989, A054990, A054992.

STATUS

approved

editing

#20 by Bruno Berselli at Thu Oct 03 05:02:05 EDT 2019

STATUS

reviewed

approved

#19 by Joerg Arndt at Thu Oct 03 04:54:51 EDT 2019

STATUS

proposed

reviewed

#18 by Amiram Eldar at Thu Oct 03 04:35:02 EDT 2019

STATUS

editing

proposed

#17 by Amiram Eldar at Thu Oct 03 03:58:00 EDT 2019

NAME

Number of prime divisors of n! - 1 (counted with multiplicity).

#16 by Amiram Eldar at Thu Oct 03 03:56:54 EDT 2019

LINKS

Amiram Eldar, <a href="/A054991/b054991.txt">Table of n, a(n) for n = 1..135</a>

EXTENSIONS

More terms from Amiram Eldar, Oct 03 2019

#15 by Amiram Eldar at Thu Oct 03 03:56:27 EDT 2019

DATA

0, 0, 1, 1, 2, 1, 1, 2, 3, 2, 4, 1, 2, 1, 5, 2, 3, 3, 3, 2, 4, 3, 2, 2, 3, 2, 2, 4, 5, 1, 3, 1, 1, 2, 3, 2, 5, 1, 4, 2, 4, 4, 7, 4, 5, 5, 2, 4, 3, 2, 5, 5, 4, 6, 6, 5, 6, 5, 2, 3, 4, 4, 5, 4, 6, 4, 7, 2, 6, 5, 5, 3, 4, 5, 7, 3, 5, 4, 2, 4, 4, 4, 4, 6, 2, 3, 4

STATUS

approved

editing

#14 by Charles R Greathouse IV at Thu Nov 21 13:07:10 EST 2013

MATHEMATICA

A054991[n_Integer] := PrimeOmega[n! - 1]; A054991[1] = 0; Table[A054991[n], {n, 2, 100}] (* From _Vladimir Joseph Stephan Orlovsky, _, Jul 22 2011 *)

Discussion

Thu Nov 21

13:07

OEIS Server: https://oeis.org/edit/global/2063