17

This number is a prime.

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The 17-year locust has the longest cycle of development of any known insect. Note that its Latin name (Cicada septemdecim) has 17 letters. The genus Magicicada is sometimes called the "seventeen-year locust," but they are not locusts; locusts belong to the order Orthoptera. [Dillon]

tan(cos(sin(x))) = .017... for any x, when this expression is computed in degree mode. [Dillon]