Encyclopedia > Seven

  Article Content


Seven (7) is the natural number following six and preceding eight.

Seven is the fourth-smallest prime number; the next is eleven. Seven is a Mersenne prime. This is because 23-1=7, and seven is a prime number.

7 goes into 999,999 exactly 142,857 times, so fractions with 7 in the denominator have six-digit repeating sequences in their decimal expansions. 1/7=0.142857142...

A seven-sided polygon is a heptagon[?]. The regular n-gons for n ≤ 6 can be constructed by ruler and compass alone, but the regular heptagon cannot.

The British fifty-pence coin is a heptagon, with the sides curved to give it a constant radius.

Cities constructed amidst seven hills include:

Seven is also:

All Wikipedia text is available under the terms of the GNU Free Documentation License

  Search Encyclopedia

Search over one million articles, find something about almost anything!
  Featured Article
Ocean Beach, New York

... is land and none of the area is covered with water. Demographics As of the census of 2000, there are 138 people, 61 households, and 35 families residing in the village. ...

This page was created in 68.7 ms