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Only one below 5000 (Posted on 2016-03-11) Difficulty: 3 of 5
If you write out the numbers from 1 to 5000 in American English (e.g., THREE THOUSAND EIGHT HUNDRED SEVENTY-THREE), it turns out that only one of them has a unique number of characters.

Which is it?

Spaces and hyphens count as characters.

See The Solution Submitted by Ady TZIDON    
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Some Thoughts re: computer solution (spoiler) | Comment 2 of 4 |
(In reply to computer solution by Charlie)

To be more specific,
THREE THOUSAND, has a unique length within the given range.
That length no longer is unique when the range is extended to 7000.

  Posted by Dej Mar on 2016-03-12 01:58:00

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