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July 6th, 2017, 10:48 AM  #1 
Newbie Joined: Jun 2017 From: canada Posts: 9 Thanks: 0  combination of n integers, product not greater than x
Hello here is my problem, I have n numbers, my multiplication combination can not involve more than 2 factors. How many products smaller than x will there be? Is there a function to determine that? Thank you. Last edited by skipjack; July 6th, 2017 at 11:45 AM. 
July 6th, 2017, 10:57 AM  #2 
Senior Member Joined: Sep 2015 From: USA Posts: 1,930 Thanks: 998 
you have n random numbers or n numbers in sequence?

July 7th, 2017, 08:32 AM  #3 
Newbie Joined: Jun 2017 From: canada Posts: 9 Thanks: 0 
exemple: n prime (11,13,17,19, 23) x not greater than 189 or x not greater than 289. I know the solution. I would like to know the path to the solution so i can do it for some other problems thank you Last edited by joswhale; July 7th, 2017 at 08:48 AM. 
July 7th, 2017, 09:01 AM  #4  
Senior Member Joined: May 2016 From: USA Posts: 1,027 Thanks: 419  Quote:
I greatly doubt there is a formula. You would have to start with an algorithm for finding the n  1 primes after a.  

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combination, greater, integers, product 
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