login
This site is supported by donations to The OEIS Foundation.

 

Logo


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: A070255 A284062 A261020 * A110403 A119247 A138595

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified April 28 17:30 EDT 2017. Contains 285578 sequences.