Jump to content

Algebra


What is 1111......1 (91digits).  

2 members have voted

  1. 1. What is 1111......1 (91digits).

    • Prime number
      0
    • Composite number


Recommended Posts

4 hours ago, joigus said:

My doctor told me to stay away from factorizing numbers that are too high. 

Why? Change doctor ;)  It is easy.. If you have decimal e.g. 1111 factors will be 101 and 11. If it is e.g. 111111 factors will be 1001 and 111. And so on. You just have to answer question if number of decimal ones is dividable and has factors by itself.

91 is not prime. It is dividable by 7 and 13.

1111111 1111111 1111111 1111111 1111111 1111111 1111111 1111111 1111111 1111111 1111111 1111111 1111111 

is dividable by 1111111.

Link to comment
Share on other sites

40 minutes ago, Sensei said:

Why? Change doctor ;)  It is easy.. If you have decimal e.g. 1111 factors will be 101 and 11. If it is e.g. 111111 factors will be 1001 and 111. And so on. You just have to answer question if number of decimal ones is dividable and has factors by itself.

91 is not prime. It is dividable by 7 and 13.

1111111 1111111 1111111 1111111 1111111 1111111 1111111 1111111 1111111 1111111 1111111 1111111 1111111 

is dividable by 1111111.

Oh, yeah, divisibility by 11 criteria give you that, right? I'd forgotten about that. Must go over that again.

But don't get me into other numbers.

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.