What is the term for the product of two prime numbers?

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The phrase "prime power" is usually used to refer to numbers of the form $p^n$ with $p$ prime and $n \geq 1$. I imagine "prime squared" or "prime square" is the most reasonable name for what you're describing.

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Mike Christensen
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Founder and Chief Architect of KitchenPC.com, the world's most powerful recipe search engine. The technology behind KitchenPC is open-source, and available on GitHub.

Updated on August 01, 2022

Comments

  • Mike Christensen
    Mike Christensen over 1 year

    Numbers that can be factored down into 2 and only 2 prime numbers, such as:

    25 (5 * 5)
    9 (3 * 3)
    12752041 (3571 * 3571)
    

    Is there a mathematical term for these numbers? I did a bit of Googling, but it's tough to search for what something is called.

    Update: To clarify, I meant the square of a single prime number. So n * n where n is prime.

    • Admin
      Admin almost 11 years
      semiprime aaaaa
    • Mike Christensen
      Mike Christensen almost 11 years
      When I looked up semiprime, it says it's a product of two prime numbers, but those prime numbers are not necessarily distinct. So 15 (3 * 5) could be semiprime, correct?
    • Dan Shved
      Dan Shved almost 11 years
      Not that I'm aware of. Frankly, I doubt it, cos' you can just call them squares of prime numbers.
    • Mike Christensen
      Mike Christensen almost 11 years
      Thanks! Though @cassandra0's answer was helpful too. I'm learning about cryptography, and semiprimes come up quite a bit.