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The enigmatic one (Posted on 2015-06-30) Difficulty: 2 of 5
1, 4, 3, 11, 15, 13, ?, ?, ?, ?, X, ...

The four integers after 13 are well defined, the 5th might be controversial.

Please comment.

  Submitted by Ady TZIDON    
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Solution: (Hide)
A001166 in OEIS.

Smallest natural number requiring n letters in English,starts with "one" (3 letters).

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  Subject Author Date
Solutionspoiler: Official solutionAdy TZIDON2015-09-01 23:29:51
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