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Special feature (Posted on 2018-07-29) Difficulty: 3 of 5
What is the biggest even number N that can't be written as a sum of odd composite numbers?

Bonus: Find another feature unique to N.

See The Solution Submitted by Ady TZIDON    
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Hints/Tips No Subject Comment 6 of 6 |
see full "official" solution, including proof
  Posted by Ady TZIDON on 2018-08-06 21:08:58
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