Seventeen
For the magazine Seventeen please see Seventeen (magazine)
Seventeen (17) is the natural number following sixteen 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. Seventeen is the age at which one may view R-rated movies without a parent's accompaniment according to MPAA standards, and in the United States is the age at which one may donate blood and join the military voluntarily.
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.
See also: fifteen, sixteen, seventeen, eighteen, nineteen, integer, list of numbers.
This article is about the number. For the year AD 17, see 17.
