A004511 - OEIS

%I #7 Oct 26 2023 23:10:05

%S 22,23,21,25,26,24,19,20,18,4,5,3,7,8,6,1,2,0,13,14,12,16,17,15,10,11,

%T 9,49,50,48,52,53,51,46,47,45,31,32,30,34,35,33,28,29,27,40,41,39,43,

%U 44,42,37,38,36,76,77,75,79

%N Tersum n + 22.

%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.

%K nonn

%O 0,1

%A _N. J. A. Sloane_