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Sphenic number

A sphenic number is a number that has precisely three distinct prime factors. The Möbius function returns negative one when passed any sphenic number.

The first ten sphenic numbers are:

  1. 30
  2. 42
  3. 66
  4. 70
  5. 78
  6. 102
  7. 105
  8. 110
  9. 114
  10. 130



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