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

only allowed 1

12 replies to this topic

#11 jim

jim

Junior Member

• Members
• 33 posts

Posted 29 August 2012 - 05:03 PM

Comments. The smallest number does require a lot of messy testing. But the largest number is another matter. As noted above, we can do 256. There are also two larger numbers we can also do. What are they?
• 0

#12 BobbyGo

BobbyGo

• Members
• 132 posts
• Gender:Male

Posted 29 August 2012 - 08:12 PM

Comments. The smallest number does require a lot of messy testing. But the largest number is another matter. As noted above, we can do 256. There are also two larger numbers we can also do. What are they?

Spoiler for 3 bigger than 256

Edited by BobbyGo, 29 August 2012 - 08:18 PM.

• 0

#13 jim

jim

Junior Member

• Members
• 33 posts

Posted 30 August 2012 - 02:51 AM

Bobby Go . Nice answer. I missed 270. There is a general method to find the largest such number with 3n-1, 3n, or 3n+1 as the number of ones--where n= m+1. It is easiest for 3n.
• 0

0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users