(17) is the natural number
and preceding eighteen
Seventeen is the 7th smallest prime number, and is a Fermat prime.
The next prime is nineteen.
At Seventeen is a famous song by Janis Ian.
The number seventeen is used as a swearword by Swedes. The origin is controversial; though it is also known in the form "Sjutton tusen jävlär". (Seventeen thousand demons.)
In the Nordic countries the seventeenth day of the year is considered the heart and/or the back of winter.
There are exactly seventeen two-dimensional space groups. These are sometimes called wallpaper groups, as they represent the seventeen possible symmetry types that can be used for wallpaper.
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