All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars    
perplexus dot info

Home > Numbers
From eleven to ... ETERNITY (Posted on 2018-07-14) Difficulty: 3 of 5
Eleven is the fifth prime number, and the smallest two-digit prime.
It's also the smallest repunit prime.

What is the next repunit prime?

See The Solution Submitted by Ady TZIDON    
No Rating

Comments: ( Back to comment list | You must be logged in to post comments.)
save a bit of work Comment 3 of 3 |
Every third repunit may be ignored as divisible by 3, since its digits sum to a number divisible by 3. Also, I wonder if all solutions have a prime number of digits...
  Posted by Steven Lord on 2018-07-14 17:12:57
Please log in:
Login:
Password:
Remember me:
Sign up! | Forgot password


Search:
Search body:
Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (9)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:
Copyright © 2002 - 2024 by Animus Pactum Consulting. All rights reserved. Privacy Information