The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A162672 Lunar product 19*n. 2
 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 (list; graph; refs; listen; history; text; internal format)
 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: A284062 A261020 A308237 * 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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified May 26 22:58 EDT 2020. Contains 334634 sequences. (Running on oeis4.)