The On-Line Encyclopedia of Integer Sequences (OEIS)

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A059249

Tersum n + (n-1); write n and n-1 in base 3 and add mod 3 with no carries.
(history; published version)

#6 by Alois P. Heinz at Tue Nov 09 18:22:37 EST 2021

STATUS

editing

approved

#5 by Alois P. Heinz at Tue Nov 09 18:22:35 EST 2021

KEYWORD

nonn,look,changed

#4 by Alois P. Heinz at Tue Nov 09 18:22:10 EST 2021

LINKS

Alois P. Heinz, <a href="/A059249/b059249.txt">Table of n, a(n) for n = 1..19682</a>

STATUS

approved

editing

#3 by Russ Cox at Fri Mar 30 18:51:33 EDT 2012

AUTHOR

_Henry Bottomley (se16(AT)btinternet.com), _, Jan 22 2001

Discussion

Fri Mar 30

18:51

OEIS Server: https://oeis.org/edit/global/247

#2 by N. J. A. Sloane at Fri Feb 27 03:00:00 EST 2009

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.

KEYWORD

nonn,new

nonn

#1 by N. J. A. Sloane at Fri May 16 03:00:00 EDT 2003

NAME

Tersum n + (n-1); write n and n-1 in base 3 and add mod 3 with no carries.

DATA

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

OFFSET

1,3

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.

KEYWORD

nonn

AUTHOR

Henry Bottomley (se16(AT)btinternet.com), Jan 22 2001

STATUS

approved