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Never prime! (3) (Posted on 2011-02-25) Difficulty: 3 of 5
The value of the smallest positive base ten integer that cannot be changed into a prime by changing a single digit was determined in Never prime!.

M denotes the smallest value of a base N positive integer that cannot be changed into a prime by changing a single digit.

For the values of N drawn at random between 51 and 100 inclusively, determine the probability that the first digit of M (reading left to right) is 3.

Note: N is a positive integer and, M cannot contain any leading zero, and the first digit of M (reading left to right) cannot be changed to a zero.

No Solution Yet Submitted by K Sengupta    
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  Subject Author Date
solutionJustin2011-03-02 09:58:41
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