# 17

This number is a prime.

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17 = 2+3+5+7 is the smallest emirp among sums of consecutive primes. Note that the reverse 71 = 19+23+29 is also such a prime. [Poo Sung]

There are 17 standard-form types of quadratic surfaces (quadrics). [Poo Sung]

The smallest prime p such that p#+1 and p#-1 are both composite. [Poo Sung]

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