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A031948
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Numbers with exactly two distinct base-3 digits.
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7
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3, 5, 6, 7, 9, 10, 12, 14, 16, 17, 18, 20, 22, 23, 24, 25, 27, 28, 30, 31, 36, 37, 39, 41, 43, 44, 49, 50, 52, 53, 54, 56, 60, 62, 67, 68, 70, 71, 72, 74, 76, 77, 78, 79, 81, 82, 84, 85, 90, 91, 93, 94, 108, 109, 111, 112, 117, 118, 120, 122
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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MAPLE
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filter:= n -> nops(convert(convert(n, base, 3), set))=2:
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MATHEMATICA
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Select[Range[150], Length[Union[IntegerDigits[#, 3]]]==2&] (* Harvey P. Dale, Nov 25 2023 *)
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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