Jump to content


Welcome to BrainDen.com - Brain Teasers Forum

Welcome to BrainDen.com - Brain Teasers Forum. Like most online communities you must register to post in our community, but don't worry this is a simple free process. To be a part of BrainDen Forums you may create a new account or sign in if you already have an account.
As a member you could start new topics, reply to others, subscribe to topics/forums to get automatic updates, get your own profile and make new friends.

Of course, you can also enjoy our collection of amazing optical illusions and cool math games.

If you like our site, you may support us by simply clicking Google "+1" or Facebook "Like" buttons at the top.
If you have a website, we would appreciate a little link to BrainDen.

Thanks and enjoy the Den :-)
Guest Message by DevFuse
 

Photo
- - - - -

combining the primes


  • Please log in to reply
4 replies to this topic

#1 phil1882

phil1882

    Senior Member

  • Members
  • PipPipPipPip
  • 521 posts

Posted 29 December 2013 - 10:12 AM

take 3 prime numbers such that they are the same distance apart form one another. 

multiply all 3, add the distance. is this number always composite?

 


  • 0

#2 ThunderCloud

ThunderCloud

    Advanced Member

  • Members
  • PipPipPip
  • 102 posts
  • Gender:Male
  • Location:New England

Posted 29 December 2013 - 07:12 PM

Spoiler for No


  • 0

#3 phil1882

phil1882

    Senior Member

  • Members
  • PipPipPipPip
  • 521 posts

Posted 30 December 2013 - 01:15 AM

ah! duh, the first most obvious example and of course I miss it. go me.

are there any other examples?


  • 0

#4 Nins_Leprechaun

Nins_Leprechaun

    Junior Member

  • Members
  • PipPip
  • 37 posts

Posted 30 December 2013 - 01:39 AM

Another example
Spoiler for

  • 0

#5 Nins_Leprechaun

Nins_Leprechaun

    Junior Member

  • Members
  • PipPip
  • 37 posts

Posted 30 December 2013 - 02:17 AM

And another one (was trying to develop a system to easily find them and gave up)
Spoiler for

Edited by Nins_Leprechaun, 30 December 2013 - 02:19 AM.

  • 0




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users