OFFSET
1,1
LINKS
Robert Israel, Table of n, a(n) for n = 1..10000
MAPLE
filter:= n -> nops(convert(convert(n, base, 3), set))=2:
select(filter, [$1..200]); # Robert Israel, Nov 29 2017
MATHEMATICA
Select[Range[150], Length[Union[IntegerDigits[#, 3]]]==2&] (* Harvey P. Dale, Nov 25 2023 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
STATUS
approved