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 twodimensional 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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