The primorial Failed to parse (lexing error):
is defined to be .
An alternate definition of primorial, called here the primorial of the second kind, is defined as the product of all the primes less than or equal to a given number. Note that the logarithm of the primorial of the second kind is the first Chebyshev function.
The ID of the sequence in the Online Encyclopedia of Integer Sequences is A002110
The values of primorials at are respectively .