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This number is a composite.
358 is the smallest number whose first two digits are distinct odd-primes such that their sum equals the third digit. [Sladcik]
The sum of th-digit splits is equal to the product of the digits: (3 + 58) + (35 + 8) + (3 + 5 + 8 ) = 3 * 5 * 8. [Sladcik]
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