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July 6th, 2017, 11:48 AM   #1
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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 12:45 PM.
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July 6th, 2017, 11:57 AM   #2
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you have n random numbers or n numbers in sequence?
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July 7th, 2017, 09:32 AM   #3
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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 09:48 AM.
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July 7th, 2017, 10:01 AM   #4
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Quote:
Originally Posted by joswhale View Post
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
You still have not described the problem. There are n successive primes starting with a. Is that it? And what is x not greater than 189 or not greater than 289 supposed to mean because as written it is redundant?

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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