While there are an infinite amount of numbers, there are, surprisingly, only 16 different non-negative integers (in other words, whole numbers greater than -1) whose names in English, when spelled out, have no repeating letters.

For example, 7 doesn't fit, because when spelled out as S-E-V-E-N, the word has two Es. -2 might seem to work, as it is spelled M-I-N-U-S-T-W-O, and has no repeating letters, but it doesn't qualify because it's negative, and I specified non-negative integers.

Enter as many of these numbers, but you must enter your answers as digits, not spelled out. This keeps spelling from being an issue. If you enter a number greater than 999, you can enter the number with or without commas.

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