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A169910 a(n) = n+n in carryless digital root arithmetic in base 10. 0
0, 2, 4, 6, 8, 1, 3, 5, 7, 9, 20, 22, 24, 26, 28, 21, 23, 25, 27, 29, 40, 42, 44, 46, 48, 41, 43, 45, 47, 49, 60, 62, 64, 66, 68, 61, 63, 65, 67, 69, 80, 82, 84, 86, 88, 81, 83, 85, 87, 89, 10, 12, 14, 16, 18, 11, 13, 15, 17, 19, 30, 32, 34, 36, 38, 31, 33, 35, 37, 39, 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 when individual digits are added or multiplied the result is replaced by its digital root (A010888).

LINKS

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

Index entries for sequences related to carryless arithmetic

CROSSREFS

Sequence in context: A088402 A077492 A007396 * A004519 A036839 A004093

Adjacent sequences:  A169907 A169908 A169909 * A169911 A169912 A169913

KEYWORD

nonn,base

AUTHOR

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

STATUS

approved

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Last modified February 27 11:38 EST 2021. Contains 341656 sequences. (Running on oeis4.)