The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A074595 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A074595

Number of prime factors of numbers that are not prime powers (with multiplicity).
(history; published version)

#9 by OEIS Server at Thu Oct 10 08:18:56 EDT 2024

LINKS

Amiram Eldar, <a href="/A074595/b074595_1.txt">Table of n, a(n) for n = 1..10000</a>

#8 by Peter Luschny at Thu Oct 10 08:18:56 EDT 2024

STATUS

reviewed

approved

Discussion

Thu Oct 10

08:18

OEIS Server: Installed first b-file as b074595.txt.

#7 by Joerg Arndt at Thu Oct 10 07:57:56 EDT 2024

STATUS

proposed

reviewed

#6 by Amiram Eldar at Thu Oct 10 07:16:36 EDT 2024

STATUS

editing

proposed

#5 by Amiram Eldar at Thu Oct 10 07:11:52 EDT 2024

CROSSREFS

Cf. A001222, A024619, A074594, A074592, A074593.

#4 by Amiram Eldar at Thu Oct 10 07:11:33 EDT 2024

LINKS

Amiram Eldar, <a href="/A074595/b074595_1.txt">Table of n, a(n) for n = 1..10000</a>

MATHEMATICA

s[n_] := Module[{f = FactorInteger[n]}, If[Length[f] > 1, Total[f[[;; , 2]]], Nothing]]; Array[s, 200] (* Amiram Eldar, Oct 10 2024 *)

STATUS

approved

editing

#3 by Russ Cox at Fri Mar 30 18:50:25 EDT 2012

AUTHOR

_Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), _, Aug 25 2002

Discussion

Fri Mar 30

18:50

OEIS Server: https://oeis.org/edit/global/246

#2 by N. J. A. Sloane at Fri Jan 09 03:00:00 EST 2009

KEYWORD

nonn,new

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystemsgmail.com), Aug 25 2002

#1 by N. J. A. Sloane at Fri May 16 03:00:00 EDT 2003

NAME

Number of prime factors of numbers that are not prime powers (with multiplicity).

DATA

2, 2, 3, 2, 2, 3, 3, 2, 2, 4, 2, 3, 3, 2, 2, 2, 4, 2, 2, 4, 3, 3, 3, 2, 5, 3, 2, 3, 4, 2, 4, 2, 2, 4, 2, 3, 2, 3, 3, 2, 3, 5, 2, 3, 3, 2, 3, 5, 2, 4, 2, 2, 2, 4, 4, 2, 3, 2, 2, 2, 6, 3, 3, 4, 3, 4, 3, 2, 5, 3, 2, 5, 3, 2, 3, 3, 2, 2, 5, 2, 2, 3, 4, 2, 3, 4, 2, 2, 4, 4, 3, 4, 2, 2, 2, 6, 2, 2, 3, 3, 4, 4, 3, 3, 2

OFFSET

1,1

FORMULA

a(n) = A001222(A024619(n)).

CROSSREFS

Cf. A074594, A074592, A074593.

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Aug 25 2002

STATUS

approved