103
This number is a prime.
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The prime with a partition into prime parts using the most distinct digits: 103 = 2 + 5 + 7 + 89. [Beedassy]
The number of digits in the first counterexample (2341) to the converse of Fermat's Little Theorem that is said to have eluded the computational skills of ancient Chinese, circa 500 BC. [Beedassy]
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