A169891 Number of numbers i in the range 1 <= i <= n such that there is a number j in the range 1 <= j <= n for which the carryless product i*j equals n.

1, 2, 2, 3, 5, 6, 2, 10, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 8, 2, 8, 2, 8, 2, 10, 2, 10, 2, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 18, 4, 18, 4, 18, 4, 20, 4, 20, 4, 50, 2, 2, 4, 4, 54, 6, 6, 8, 8, 36, 6, 36, 6, 36, 6, 38, 6, 38, 6, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 50, 8, 50, 8, 50, 8, 52, 8, 52, 8, 16

Offset

1,2

Comments

Counted with multiplicity.

Links

Table of n, a(n) for n=1..90.

Index entries for sequences related to carryless arithmetic

Crossrefs

Cf. A000005, A169892, A169893, A169987-A169899.

Sequence in context: A292802 A247376 A101779 * A137756 A333468 A364971

Adjacent sequences: A169888 A169889 A169890 * A169892 A169893 A169894

Keyword

nonn,base

Author

David Applegate, Marc LeBrun and N. J. A. Sloane, Jul 06 2010

Status

approved