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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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Some Thoughts re: computer solution and tidbits from a reference | Comment 3 of 6 |
(In reply to computer solution and tidbits from a reference by Charlie)

The assertion credited to Derrick Niederman:
"... 38 when written as Roman numeral XXXVIII is the last Roman
numeral alphabetically of all possible Roman numerals," is incorrect.
The Roman numerals X, V, I are not in alphabetical sequence, but in reverse alphabetical sequence. As x is alphabetically the last in the sequence of distinct Roman numerals, and v is the next to the last, Niederman correctly identifies the last Roman numeral in the set where the number is in reverse alphabetical order.

  Posted by Dej Mar on 2018-07-30 03:08:53

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