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Move the 2 - double the number (Posted on 2002-04-19) Difficulty: 3 of 5
A certain number ends with the digit 2. Moving the 2 from the end of the number to its front doubles it. Can you find this number?

(Hint: it's quite large)

See The Solution Submitted by levik    
Rating: 4.1111 (9 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
My Answer | Comment 2 of 10 |
I actually wrote a program to go through and find this number... since it was so huge, I spent the majority of my time optimising the code. Also, I ran into some precision problems since the answer of the order of magnitude of 1e+17. Cool problem.
  Posted by Tom on 2002-05-09 12:15:01
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