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

Home > Numbers
One and only (Posted on 2016-04-28) Difficulty: 2 of 5
There is only one prime p such that p! is p digits long.

Find it and prove its uniqueness.

No Solution Yet Submitted by Ady TZIDON    
No Rating

Comments: ( Back to comment list | You must be logged in to post comments.)
re: spoiler Comment 4 of 4 |
(In reply to spoiler by xdog)

25! has 26 digits and 25 is not prime.

Only 23 works, without qualification.

  Posted by Charlie on 2016-04-28 10:39:05
Please log in:
Remember me:
Sign up! | Forgot password

Search body:
Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (1)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Copyright © 2002 - 2018 by Animus Pactum Consulting. All rights reserved. Privacy Information