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Phi(63) = 36. [McCranie]
3n + 2 is prime for n = 63 or its reversal, 36. [Honaker]
63 is the smallest number that can be expressed with 3 identical odd prime digits: 63 = 333 in base 4. [Necula]
(63) = phi(63) - 6*3. [Firoozbakht]
(63) = 6*3. [Kumar]
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