

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
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OFFSET

0,2


COMMENTS

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



