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
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]
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
Comments