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A171723
a(n) = 0+1+2+...+n in lunar arithmetic in base 9 written in base 9.
0
0, 1, 2, 3, 4, 5, 6, 7, 8, 18, 18, 18, 18, 18, 18, 18, 18, 18, 28, 28, 28, 28, 28, 28, 28, 28, 28, 38, 38, 38, 38, 38, 38, 38, 38, 38, 48, 48, 48, 48, 48, 48, 48, 48, 48, 58, 58, 58, 58, 58, 58, 58, 58, 58, 68, 68, 68, 68, 68, 68, 68, 68, 68, 78, 78, 78, 78, 78, 78, 78, 78, 78
OFFSET
0,3
LINKS
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]
CROSSREFS
Sequence in context: A205406 A066759 A204928 * A039050 A250043 A366103
KEYWORD
nonn,base
AUTHOR
N. J. A. Sloane, Oct 02 2010
STATUS
approved