617

This number is a prime.

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+ The largest prime factor of 1234 (1234=2*617). Note that the concatenation of the factors of 1234 creates another prime (2617). [Loungrides]

+ The largest prime of form p^q-r^s, with prime bases, where bases and exponents are consecutive numbers, i.e., 617=5^4-2^3. [Loungrides]

(There is one curio for this number that has not yet been approved by an editor.)

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