Look up: Primorial

1. 
   Primorial
   Definition (advanced level) For a prime p, the primorial of p is the product of all primes up to and including p.
   Found on http://thesaurus.maths.org/mmkb/entry.ht
   
   
2. 
   Primorial
   For `n` ≥ 2, the `primorial` (`n`#) is the product of all prime numbers less than or equal to `n`. For example, 7# = 210 is a primorial which is the product of the first four primes multiplied together (2÷3÷5÷7). The name is attributed to Harvey Dubner and is a portmanteau of `prime` and `factorial`. The first few primorials are: :2, 6, 30, 210, 2310, 30030, 510510, 9699690, 223092870, 6469693230, 200560490130, 7420738134810, 304250263527210,...
   Found on http://en.wikipedia.org/wiki/Primorial
   
   
3. 
   primorial
   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.
   Found on http://www.daviddarling.info/encyclopedi