What are the numbers in the question marks?
0, 1, 2, ?, 5, 6, 8, ?, 40, 46, 60, ?, 84
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I have a theory that
These are numbers that, spelled out in English, have no duplicate letters.
The first question mark would be FOUR (since THREE has 2 E's), the second one - TEN (NINE, ELEVEN, TWELVE, *TEEN, TWENTY * and THIRTY * are out).
But I'm confused by the 3rd question mark, as
There are multiple numbers between 60 and 84 that can be spelled without duplicate letters: SIXTY ONE, SIXTY FOUR and EIGHTY itself. I'm not sure how to pick just one of them...