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A cool prime number (Posted on 2011-01-27) Difficulty: 2 of 5
My friend was thinking of a 3-digit prime number. I asked him, "What are the last two digits of your number?" He answered, and I knew what the number was. What was the number?

  Submitted by Math Man    
Rating: 4.0000 (2 votes)
Solution: (Hide)
389. It is the only 3-digit prime ending in 89.

Comments: ( You must be logged in to post comments.)
  Subject Author Date
Possible solutionbroll2011-01-28 01:53:12
SolutionSolutionDej Mar2011-01-27 18:09:08
SolutionSolution (Using Excel)hoodat2011-01-27 15:13:26
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