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A169909 a(n) = n+n in carryless arithmetic mod 9 in base 10. 0
0, 2, 4, 6, 8, 1, 3, 5, 7, 0, 20, 22, 24, 26, 28, 21, 23, 25, 27, 20, 40, 42, 44, 46, 48, 41, 43, 45, 47, 40, 60, 62, 64, 66, 68, 61, 63, 65, 67, 60, 80, 82, 84, 86, 88, 81, 83, 85, 87, 80, 10, 12, 14, 16, 18, 11, 13, 15, 17, 10, 30, 32, 34, 36, 38, 31, 33, 35, 37, 30, 50, 52, 54, 56, 58 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Addition and multiplication are the same as in school, that is, done in base 10, except that there are no carries and individual digits are added or multiplied mod 9.

LINKS

Table of n, a(n) for n=0..74.

Index entries for sequences related to carryless arithmetic

CROSSREFS

Sequence in context: A127353 A032763 A146082 * A180592 A004092 A133311

Adjacent sequences:  A169906 A169907 A169908 * A169910 A169911 A169912

KEYWORD

nonn,base

AUTHOR

David Applegate, Marc LeBrun and N. J. A. Sloane, Jul 11 2010

STATUS

approved

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Last modified March 1 03:32 EST 2021. Contains 341732 sequences. (Running on oeis4.)