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50 - Digit Number (Posted on 2003-11-15) Difficulty: 3 of 5
A number of 50 digits has all its digits equal to 1 except the 26th digit. If the number is divisible by 13, then find the digit in the 26th place.

See The Solution Submitted by Ravi Raja    
Rating: 3.3333 (6 votes)

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re(7): solution | Comment 27 of 39 |
(In reply to re(6): solution by SilverKnight)

Your opinion carries weight with me as you appear to be the star solver on this site. None of the hyperlinks I could find on "mod m" are suitable to pass on here. The books I could find aren't either. Perhaps you know of a hyperlink or book that is suitable. I know that I am done trying to explain the concept to novices. For the more advanced, I highly recommend a gander at the first sections of Gauss' Disquistiones Arithmeticae in the Clarke translation.
  Posted by Richard on 2003-11-23 12:24:27

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