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# 63

This number is a composite.

63 is the smallest number that can be expressed with 3 identical odd prime digits: 63 = 333 in base 4. [Necula]

π(63) = 6*3. [Kumar]

63^63-220 is the only positive non-titanic prime of form n^n minus the smallest amicable number. [Loungrides]

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