Encyclopedia > Composite number

  Article Content

Composite number

A composite number is a natural number larger than 1 that is not a prime number. The first ten composite numbers are:

4, 6, 8, 9, 10, 12, 14, 15, 16 and 18.

A composite number which has precisely three distinct prime factors is called a sphenic number.

The ten first sphenic numbers are:

  1. 30; which is also 11-agonal by polygonality and bracketed by twin primes
  2. 42; which is bracketed by twin primes
  3. 66; which is also triangular, hexagonal, 23-agonal and a palindrome
  4. 70; which is also pentagonal and 13-agonal
  5. 78
  6. 102; which is bracketed by twin primes
  7. 105; which is also 12-agonal
  8. 110
  9. 114
  10. 130; which is also 23-agonal



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
East Farmingdale, New York

... households, and 1,286 families residing in the town. The population density is 387.5/km² (1,003.8/mi²). There are 1,723 housing units at an average density ...

 
 
 
This page was created in 25.3 ms