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Prime with distinct digits (Posted on 2013-09-18) Difficulty: 3 of 5
What is the biggest prime number, no digits repeated if

a. zero can be included?
b. zero is excluded?

  Submitted by Ady TZIDON    
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Solution: (Hide)
9876543210 is the largest number with all digit being different. 987654321- if zeroeless.
Starting with those numbers and going down we find the primes 987654103 in the 1st case and 98765431 in the 2nd case.

Comments: ( You must be logged in to post comments.)
  Subject Author Date
Hints/Tipsre: computer solutionAdy TZIDON2013-09-18 20:16:51
Solutioncomputer solutionCharlie2013-09-18 17:33:46
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