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A059249 Tersum n + (n-1); write n and n-1 in base 3 and add mod 3 with no carries. 1
1, 0, 5, 7, 6, 2, 4, 3, 17, 19, 18, 23, 25, 24, 20, 22, 21, 8, 10, 9, 14, 16, 15, 11, 13, 12, 53, 55, 54, 59, 61, 60, 56, 58, 57, 71, 73, 72, 77, 79, 78, 74, 76, 75, 62, 64, 63, 68, 70, 69, 65, 67, 66, 26, 28, 27, 32, 34, 33, 29, 31, 30, 44, 46, 45, 50, 52, 51, 47, 49, 48, 35 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..72.

EXAMPLE

a(21)=14 since 21 and 20 are written in base 3 as 210 and 202 and so their tersum is 112 in base 3, i.e. 9+3+2=14.

CROSSREFS

Cf. A004482, A004488, A004489, A038712.

Sequence in context: A063005 A145577 A144478 * A175294 A196615 A305200

Adjacent sequences:  A059246 A059247 A059248 * A059250 A059251 A059252

KEYWORD

nonn

AUTHOR

Henry Bottomley, Jan 22 2001

STATUS

approved

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Last modified September 20 10:44 EDT 2019. Contains 327229 sequences. (Running on oeis4.)