A169983 Number of lunar divisors of the number 999...9 (with n 9's).

1, 2, 3, 13, 32, 222, 664, 4355, 20853

Offset

1,2

Links

Table of n, a(n) for n=1..9.

D. Applegate, M. LeBrun and N. J. A. Sloane, Dismal Arithmetic [Note: we have now changed the name from "dismal arithmetic" to "lunar arithmetic" - the old name was too depressing]

Index entries for sequences related to dismal (or lunar) arithmetic

Example

The 13 lunar divisors of 9999 are 9, 99, 909, 919, 929, 939, 949, 959, 969, 979, 989, 999, 9999

Crossrefs

Cf. A169982.

Sequence in context: A073688 A299967 A216359 * A151461 A228278 A174742

Adjacent sequences: A169980 A169981 A169982 * A169984 A169985 A169986

Keyword

nonn,more

Author

David Applegate, Marc LeBrun and N. J. A. Sloane, Aug 21 2010

Status

approved