# primorial

A primorial, also known as a **prime factorial**, is 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.