A004492 - OEIS

%I #16 Dec 27 2023 08:31:32

%S 3,4,5,6,7,8,0,1,2,12,13,14,15,16,17,9,10,11,21,22,23,24,25,26,18,19,

%T 20,30,31,32,33,34,35,27,28,29,39,40,41,42,43,44,36,37,38,48,49,50,51,

%U 52,53,45,46,47,57,58,59,60

%N Tersum n + 3.

%H <a href="/index/Rec#order_08">Index entries for linear recurrences with constant coefficients</a>, signature (2,-1,-1,2,-1,-1,2,-1).

%F 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.

%F G.f.: (3 - 2*x + 3*x^3 - 2*x^4 - 6*x^6 + 7*x^7)/((-1+x)^2*(1+x^3+x^6)). - _Jinyuan Wang_, Mar 10 2020

%K nonn,easy

%O 0,1

%A _N. J. A. Sloane_