# 17

This number is a prime.

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The smallest multidigit prime which requires exactly a prime number of letters to spell in both English and Latin ("seventeen" has 19 letters, and "septemdecim" has 11 letters). [Post]

The smallest prime factor of the semiprime 17#-1 is the reversal of 17-1. [Post]

(There are 3 curios for this number that have not yet been approved by an editor.)

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