Factoring the Sphenic Numbers
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A sphenic number is a positive integer that is the product of three distinct primes. All sphenic numbers have exactly eight divisors.
Contributed by: Michael Croucher (March 2011)
Open content licensed under CC BY-NC-SA
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"Factoring the Sphenic Numbers"
http://demonstrations.wolfram.com/FactoringTheSphenicNumbers/
Wolfram Demonstrations Project
Published: March 7 2011