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

0,2

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.

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]

Formula

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

Example

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

Crossrefs

Cf. A087062, A078645.

Sequence in context: A308237 A362023 A347471 * A110403 A119247 A297269

Adjacent sequences: A162669 A162670 A162671 * A162673 A162674 A162675

Keyword

nonn,base

Author

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

Extensions

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

Status

approved