A088475 Numbers n such that the lunar sum of the distinct lunar prime divisors of n is >= n.

10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75

Offset

1,1

Links

Table of n, a(n) for n=1..66.

D. Applegate, C program for lunar arithmetic and number theory [Note: we have now changed the name from "dismal arithmetic" to "lunar arithmetic" - the old name was too depressing]

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]

D. Applegate, M. LeBrun, N. J. A. Sloane, Dismal Arithmetic, J. Int. Seq. 14 (2011) # 11.9.8.

Tanya Khovanova, Non Recursions

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

Example

The only lunar prime that divides 10 is 90: 90*1 = 10 (cf. A087061, A087062, A087097) and 90 >= 10, so 10 is a member. - N. J. A. Sloane, Mar 04 2007, corrected Oct 07 2010.

Crossrefs

Complement is A088472, which starts 1, 2, 3, 4, 5, 6, 7, 8, 9, 100, 110, 112, ...

Sequence in context: A377712 A350494 A168100 * A171891 A328075 A001637

Adjacent sequences: A088472 A088473 A088474 * A088476 A088477 A088478

Keyword

nonn,base

Author

David Applegate, Nov 11 2003

Extensions

Definition made more precise by Marc LeBrun, Mar 04 2007

Status

approved