In mathematics, and more particularly in number theory, primorial is a function from natural numbers to natural numbers similar to the factorial function, but rather than successively multiplying positive integers, only prime numbers are multiplied. There are two conflicting definitions that differ in the interpretation of the argument: the first ...
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Also known as a prime factorial, the product of all prime numbers that are less than or equal to a given prime p; it is denoted p#. For example 3# = 2 × 3 = 6, 5# = 2 × 3 × 5 = 30, and 13# = 2 × 3 × 5 × 7 × 11 × 13 = 30030.
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http://www.daviddarling.info/encyclopedia/P/primorial.html
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