perplexus.info :: Numbers : Unique definition

Home > Numbers

Unique definition (Posted on 2018-05-07)

What is the only 2-digit number that is one less than twice its reverse?

No Solution Yet Submitted by Ady TZIDON

No Rating

Comments: ( Back to comment list | You must be logged in to post comments.)

2-digit and beyond

Comment 1 of 1

73 = 2*37-1

793 = 2*397-1

7993 = 2*3997-1

10^(n+1) - 2*10^n - 7 = 2[10^(n+1) - 6*10^n - 3] -1

Posted by Jer on 2018-05-07 09:54:32

Please log in:

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

Chatterbox:


perplexus dot info