Almost prime

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Notion

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Science and technology

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What Wikipedia says

In number theory, a natural number is called k-almost prime if it has k prime factors. More formally, a number n is k-almost prime if and only if Ω(n) = k, where Ω(n) is the total number of primes in the prime factorization of n (can be also seen as the sum of all the primes' exponents):

Excerpt from the Wikipedia article “Almost prime”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Hyacinth, CC BY-SA 4.0, via Wikimedia Commons.