The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A079169 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A079169

Difference between A079168(n) and A079167(n).
(history; published version)

#8 by N. J. A. Sloane at Wed May 31 16:15:23 EDT 2017

STATUS

proposed

approved

#7 by Antti Karttunen at Wed May 31 09:45:13 EDT 2017

STATUS

editing

proposed

#6 by Antti Karttunen at Wed May 31 09:30:48 EDT 2017

LINKS

Antti Karttunen, <a href="/A079169/b079169.txt">Table of n, a(n) for n = 1..10000</a>

#5 by Antti Karttunen at Wed May 31 09:27:34 EDT 2017

DATA

0, 0, 0, 0, 0, 2, 0, 0, 0, 2, 0, 2, 0, 2, 2, 0, 0, 4, 0, 2, 2, 2, 0, 2, 0, 2, 0, 2, 0, 8, 0, 0, 2, 2, 2, 4, 0, 2, 2, 2, 0, 8, 0, 2, 2, 2, 0, 2, 0, 4, 2, 2, 0, 6, 2, 2, 2, 2, 0, 8, 0, 2, 2, 0, 2, 8, 0, 2, 2, 8, 0, 4, 0, 2, 4, 2, 2, 8, 0, 2, 0, 2, 0, 8, 2, 2, 2, 2, 0, 10, 2, 2, 2, 2, 2, 2, 0, 4, 2, 4, 0, 8, 0, 2, 8, 2

OFFSET

2,5

1,6

EXAMPLE

a(10) = A079168(10) - A079167(10) = 5-3 = 2.

EXTENSIONS

a(1) = 0 prepended by Antti Karttunen, May 31 2017

STATUS

approved

editing

#4 by Russ Cox at Sat Mar 31 13:21:55 EDT 2012

AUTHOR

_Jon Perry (perry(AT)globalnet.co.uk), _, Dec 31 2002

Discussion

Sat Mar 31

13:21

OEIS Server: https://oeis.org/edit/global/886

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

PROG

(PARI) weightedroundness(n)=local(f, fl, s); f=factor(n); fl=length(f[, 1]); s=0; for (i=1, fl, s=s+i*f[, 2][i]); s alias(wr, weightedroundness) weightedroundness2(n)=local(f, fl, s); f=factor(n); fl=length(f[, 1]); s=0; for (i=1, fl, s=s+i^2*f[, 2][i]); s alias(wr2, weightedroundness2) for (j=2, 500, print1(wr2(j)-wr(j)", "))

KEYWORD

nonn,new

nonn

#2 by N. J. A. Sloane at Thu Feb 19 03:00:00 EST 2004

PROG

KEYWORD

nonn,new

nonn

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

NAME

Difference between A079168(n) and A079167(n).

DATA

0, 0, 0, 0, 2, 0, 0, 0, 2, 0, 2, 0, 2, 2, 0, 0, 4, 0, 2, 2, 2, 0, 2, 0, 2, 0, 2, 0, 8, 0, 0, 2, 2, 2, 4, 0, 2, 2, 2, 0, 8, 0, 2, 2, 2, 0, 2, 0, 4, 2, 2, 0, 6, 2, 2, 2, 2, 0, 8, 0, 2, 2, 0, 2, 8, 0, 2, 2, 8, 0, 4, 0, 2, 4, 2, 2, 8, 0, 2, 0, 2, 0, 8, 2, 2, 2, 2, 0, 10, 2, 2, 2, 2, 2, 2, 0, 4, 2, 4, 0, 8, 0, 2, 8, 2

OFFSET

2,5

EXAMPLE

a(10)=A079168(10)-A079167(10)=5-3=2

PROG

CROSSREFS

Cf. A079167, A079168, A001222.

KEYWORD

nonn

AUTHOR

Jon Perry (perry(AT)globalnet.co.uk), Dec 31 2002

STATUS

approved