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%I #11 Oct 26 2023 08:31:11
%S 9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,0,1,2,3,4,5,6,7,
%T 8,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,27,28,29,30,
%U 31,32,33,34,35,63,64,65,66
%N Tersum n + 9.
%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.
%Y Cf. A004482, A004483, A004492, A004493, A004494, A004495, A004496, A004497.
%K nonn
%O 0,1
%A _N. J. A. Sloane_
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