The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A079294 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A079294

Number of distinct prime factors of the numerator of the 2n-th Bernoulli number.
(history; published version)

#14 by Susanna Cuyler at Sun Feb 09 08:39:34 EST 2020

STATUS

reviewed

approved

#13 by Michel Marcus at Sun Feb 09 07:14:51 EST 2020

STATUS

proposed

reviewed

#12 by Amiram Eldar at Sun Feb 09 06:22:19 EST 2020

STATUS

editing

proposed

#11 by Amiram Eldar at Sun Feb 09 06:02:37 EST 2020

FORMULA

a(n) = A001221(abs(A000367(n))). - Amiram Eldar, Feb 09 2020

MATHEMATICA

Table[PrimeNu[Numerator[BernoulliB[2n]]], {n, 0, 30}] (* Amiram Eldar, Feb 09 2020 *)

#10 by Amiram Eldar at Sun Feb 09 05:59:02 EST 2020

FORMULA

a(n) = A001221(A000367(n)). - Amiram Eldar, Feb 09 2020

CROSSREFS

Cf. A001221, A000367, A046886.

#9 by Amiram Eldar at Sun Feb 09 05:56:47 EST 2020

LINKS

Amiram Eldar, <a href="/A079294/b079294.txt">Table of n, a(n) for n = 0..103</a>

STATUS

approved

editing

#8 by Russ Cox at Fri Mar 30 18:39:12 EDT 2012

AUTHOR

_Benoit Cloitre (benoit7848c(AT)orange.fr), _, Feb 09 2003

Discussion

Fri Mar 30

18:39

OEIS Server: https://oeis.org/edit/global/216

#7 by Russ Cox at Fri Mar 30 17:22:27 EDT 2012

EXTENSIONS

More terms from _T. D. Noe (noe(AT)sspectra.com), _, Feb 13 2004

Discussion

Fri Mar 30

17:22

OEIS Server: https://oeis.org/edit/global/120

#6 by N. J. A. Sloane at Sun Jun 29 03:00:00 EDT 2008

KEYWORD

nonn,new

nonn

AUTHOR

Benoit Cloitre (abmtbenoit7848c(AT)wanadooorange.fr), Feb 09 2003

#5 by N. J. A. Sloane at Wed Sep 21 03:00:00 EDT 2005

KEYWORD

nonn,new

nonn

AUTHOR

Benoit Cloitre (abcloitreabmt(AT)modulonetwanadoo.fr), Feb 09 2003