login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A145110 Number of elements in the Redheffer matrix that contribute to the Moebius function. 0
1, 2, 3, 6, 5, 10, 7, 13, 11, 14 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
a(11) to a(30) are conjectured to be 11, 23, 13, 18, 19, 25, 17, 29, 19, 30, 26, 26, 23, 45, 27, 30, 32, 39, 29, 48. [From Mats Granvik, Dec 21 2008]
LINKS
EXAMPLE
Contribution from Mats Granvik, Dec 21 2008: (Start)
The contributing elements for a(8) are:
0,0,0,0,0,0,0,1
1,1,0,0,0,0,0,0
0,0,1,0,0,0,0,0
1,1,0,1,0,0,0,0
0,0,0,0,1,0,0,0
0,0,0,0,0,1,0,0
0,0,0,0,0,0,1,0
1,1,0,1,0,0,0,0
where rows 8, 4 and 2 are included because they are divisors of 8. The sum of this array is 13, therefore a(8) = 13. (End)
CROSSREFS
Sequence in context: A319785 A080029 A091239 * A257405 A373545 A043547
KEYWORD
more,nonn
AUTHOR
Mats Granvik, Oct 02 2008
EXTENSIONS
a(9)-a(10) from Mats Granvik, Oct 05 2008
Moved conjectured terms a(11)-a(30) to Comments. - N. J. A. Sloane, May 22 2014
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 20 09:16 EDT 2024. Contains 373515 sequences. (Running on oeis4.)