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%I #7 Oct 26 2023 22:56:39
%S 15,16,17,9,10,11,12,13,14,24,25,26,18,19,20,21,22,23,6,7,8,0,1,2,3,4,
%T 5,42,43,44,36,37,38,39,40,41,51,52,53,45,46,47,48,49,50,33,34,35,27,
%U 28,29,30,31,32,69,70,71,63
%N Tersum n + 15.
%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_
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