A004495 Tersum n + 6.

6, 7, 8, 0, 1, 2, 3, 4, 5, 15, 16, 17, 9, 10, 11, 12, 13, 14, 24, 25, 26, 18, 19, 20, 21, 22, 23, 33, 34, 35, 27, 28, 29, 30, 31, 32, 42, 43, 44, 36, 37, 38, 39, 40, 41, 51, 52, 53, 45, 46, 47, 48, 49, 50, 60, 61, 62, 54, 55, 56, 57, 58, 59, 69, 70, 71, 63, 64

Offset

0,1

Links

Chris R. Rehmann, Table of n, a(n) for n = 0..10000

Index entries for linear recurrences with constant coefficients, signature (2,-1,-1,2,-1,-1,2,-1).

Formula

Tersum m + n : write m and n in base 3 and add mod 3 with no carries, e.g. 5 + 8 = "21" + "22" = "10" = 1.

G.f.: (6 - 5*x - 3*x^3 + 4*x^4 - 3*x^6 + 4*x^7)/((-1+x)^2*(1+x^3+x^6)). - Jinyuan Wang, Mar 10 2020

a(n) ~ n. - Charles R Greathouse IV, May 26 2026

Prog

(PARI) a(n)=n+if(n%9>2, -3, 6) \\ Charles R Greathouse IV, May 26 2026

Crossrefs

Row m=6 of A004489.

Sequence in context: A205867 A347417 A046256 * A301863 A284362 A394809

Adjacent sequences: A004492 A004493 A004494 * A004496 A004497 A004498

Keyword

nonn,base,easy

Author

N. J. A. Sloane

Status

approved