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

Author

Mats Granvik, Oct 02 2008

Keywords

• more
• nonn

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]

Examples

			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.

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