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.

(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