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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]

+ pi(63) = 6*3. [Kumar]

(There are 2 curios for this number that have not yet been approved by an editor.)




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