The Sphenic number reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Sphenic number

A sphenic number is a number that has precisely three distinct prime factors. The Möbius function returns -1 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

See also

• Sphenic numbers from On-Line Encyclopedia of Integer Sequences.

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