A186510 Number of lunar divisors of the decimal (lunar) number 111...1 (with n 1's).

9, 90, 819, 7461, 67968, 619902, 5660208, 51746211, 473692869, 4342348692, 39865757616, 366573510504, 3376339346538, 31152497957100, 287964157783869, 2666972253081303, 24749535734382636, 230152606404800004, 2144836146346691706, 20032155489077131482, 187516277719282274940, 1759326436323972795042

Offset: 1

Author

N. J. A. Sloane, Feb 22 2011

Keywords

• base
• nonn

Comments

It appears that this gives the largest number of lunar divisors of any n-digit lunar number.

Links

• N. J. A. Sloane, Table of n, a(n) for n = 1..50
• 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

Crossrefs

Cf. A087029, A186443.

Extensions

More terms from N. J. A. Sloane, Feb 26 2011