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 Composite number 

A composite number is a natural number larger than 1 that isn't 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

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