My Math Forum combination of n integers, product not greater than x

 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:
 Originally Posted by joswhale 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.

 Tags combination, greater, integers, product

 Thread Tools Display Modes Linear Mode

 Similar Threads Thread Thread Starter Forum Replies Last Post srecko Linear Algebra 1 October 27th, 2016 11:25 AM matisolla Probability and Statistics 2 April 16th, 2015 06:23 PM Kreiger Differential Equations 2 April 16th, 2014 04:51 PM Bromster Number Theory 5 March 21st, 2014 07:18 AM fantom.1040 Algebra 7 June 28th, 2011 05:22 PM

 Contact - Home - Forums - Cryptocurrency Forum - Top