A190642 - OEIS

A190642

Numbers 3n+2 written in base 3.

2, 12, 22, 102, 112, 122, 202, 212, 222, 1002, 1012, 1022, 1102, 1112, 1122, 1202, 1212, 1222, 2002, 2012, 2022, 2102, 2112, 2122, 2202, 2212, 2222, 10002, 10012, 10022, 10102, 10112, 10122, 10202, 10212, 10222, 11002, 11012, 11022, 11102, 11112, 11122, 11202, 11212, 11222, 12002, 12012, 12022, 12102, 12112, 12122, 12202, 12212, 12222, 20002, 20012, 20022, 20102, 20112, 20122, 20202, 20212, 20222, 21002, 21012, 21022, 21102, 21112, 21122, 21202, 21212, 21222, 22002, 22012, 22022, 22102, 22112, 22122, 22202, 22212, 22222

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

In base 3 lunar arithmetic, sum of divisors of n = n (an analog of perfect numbers).

LINKS

Table of n, a(n) for n=1..81.

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]

Index entries for sequences related to dismal (or lunar) arithmetic

CROSSREFS

Cf. A016789.

Sequence in context: A244188 A189330 A120672 * A108960 A111095 A073211

Adjacent sequences: A190639 A190640 A190641 * A190643 A190644 A190645

KEYWORD

nonn,base

AUTHOR

N. J. A. Sloane, May 15 2011

STATUS

approved