Primorial is nothing but the product of all prime numbers from 1 to the given number.

Example:

15# = 2 x 3 x 5 x 7 x 11 x 13 = 30030

So the primorial of 15 is the product of prime number from 1 to 15 which are 2, 3, 5, 7, 11, 13, which is equal to 30030.

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