A162672 Lunar product 19*n.

0, 11, 12, 13, 14, 15, 16, 17, 18, 19, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150

Offset: 0

Author

Emilie Hogan, Dennis Hou, Kellen Myers and N. J. A. Sloane, Apr 09 2010

Keywords

• nonn
• base

Comments

Since 19 is the smallest lunar prime, this is a kind of lunar analog of the even numbers.

As the b-file shows, this sequence is not monotonic and contains repetitions.

Examples

			19 * 3 = 13, so 13 is a member. 1109 has just two divisors, 9 and 109, so 1109 is not a member.
		

Links

• N. J. A. Sloane, Table of n, a(n) for n = 0..10000
• 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]

Crossrefs

Cf. A087062, A078645.

Formula

For a two-digit number n, the lunar product 19*n is obtained by putting a 1 in front of n.

Extensions

Entry revised by N. J. A. Sloane, May 28 2011, to correct errors in some of the comments