Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A066779
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A066779 Sum of square-free numbers <=n. +0
1
1, 3, 6, 6, 11, 17, 24, 24, 24, 34, 45, 45, 58, 72, 87, 87, 104, 104, 123, 123, 144, 166, 189, 189, 189, 215, 215, 215, 244, 274, 305, 305, 338, 372, 407, 407, 444, 482, 521, 521, 562, 604, 647, 647, 647, 693, 740, 740, 740, 740, 791, 791, 844, 844, 899, 899 (list; graph; listen)
OFFSET

1,2

FORMULA

a(n)=sum(i=1, n, mu(i)^2*i).

CROSSREFS

Cf. A013928.

Sequence in context: A135610 A113497 A119980 this_sequence A132384 A066297 A012212

Adjacent sequences: A066776 A066777 A066778 this_sequence A066780 A066781 A066782

KEYWORD

nonn

AUTHOR

Benoit Cloitre (benoit7848c(AT)orange.fr), Jan 18 2002

page 1

Search completed in 0.002 seconds

Lookup | Welcome | Find friends | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
More pages | Superseeker | Maintained by N. J. A. Sloane (njas@research.att.com)

Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.


AT&T Labs Research