17

This number is a prime.

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The 17th letter of the alphabet, Q, is the only letter that doesn't appear in the name of any U.S. state. [Gaydos]

There are 17 happy two-digit numbers. [Gaydos]

On a TRS-80 Model 1 floppy disk, the directory was on track 17. [Gaydos]

Six times the natural logarithm of 17 is almost 17. [Gaydos]

Prime numbers that end with "17" occur more often than any other 2-digit ending among the first 100 million primes. [Gaydos]

17! is the smallest factorial number that falls between two sphenic numbers. [Gaydos]

There are exactly 17 different prime numbers in the substrings of the digits of 17^17. [Gaydos]