Primorial
Product of the first prime numbers / From Wikipedia, the free encyclopedia
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Not to be confused with primordial.
In mathematics, and more particularly in number theory, primorial, denoted by "#", is a function from natural numbers to natural numbers similar to the factorial function, but rather than successively multiplying positive integers, the function only multiplies prime numbers.
Look up -ial in Wiktionary, the free dictionary.
The name "primorial", coined by Harvey Dubner, draws an analogy to primes similar to the way the name "factorial" relates to factors.