17

This number is a prime.

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Prime Numbers CD Image J. Neptune © 1994
+ 2n - 17 is prime for n = 6, 8, 22, 44, 414, 444, 808 and 848, not to mention the non-palindromic values of n. [Kulsha]

+ 17 is the only prime of the form pq + qp, where p and q are prime. [Kulsha]

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