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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.

See The Solution Submitted by Ady TZIDON    
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Solution spoiler: Official solution Comment 1 of 1
A001166

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

Edited on September 1, 2015, 11:31 pm
  Posted by Ady TZIDON on 2015-09-01 23:29:51

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