A145110 Number of elements in the Redheffer matrix that contribute to the Moebius function.

1, 2, 3, 6, 5, 10, 7, 13, 11, 14

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

Table of n, a(n) for n=1..10.

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

Cf. A008683, A143104.

Sequence in context: A319785 A080029 A091239 * A257405 A043547 A338702

Adjacent sequences: A145107 A145108 A145109 * A145111 A145112 A145113

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