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%I #7 Oct 26 2023 23:09:38
%S 21,22,23,24,25,26,18,19,20,3,4,5,6,7,8,0,1,2,12,13,14,15,16,17,9,10,
%T 11,48,49,50,51,52,53,45,46,47,30,31,32,33,34,35,27,28,29,39,40,41,42,
%U 43,44,36,37,38,75,76,77,78
%N Tersum n + 21.
%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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