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Xenodromes: all digits in base 3 are different.
5

%I #9 Jul 29 2021 17:33:29

%S 0,1,2,3,5,6,7,11,15,19,21

%N Xenodromes: all digits in base 3 are different.

%t FromDigits[#,3]&/@Flatten[Permutations/@Subsets[{0,1,2}],1]//Union (* _Harvey P. Dale_, Jul 29 2021 *)

%K nonn,base,fini,full,easy

%O 1,3

%A _Olivier GĂ©rard_