Morningstar Posted February 14, 2013 Report Share Posted February 14, 2013 Just a quick math problem that shouldn't take too long. The digits 0-9 can be arranged into 3,628,800 distinct 10-digit numbers (including a leading 0). Of these, how many are prime? Quote Link to comment Share on other sites More sharing options...

0 k-man Posted February 14, 2013 Report Share Posted February 14, 2013 None. They are all divisible by 3 and 9 (the sum of 1 through 9 is 45 and is divisible by 3 and 9) Quote Link to comment Share on other sites More sharing options...

0 Morningstar Posted February 14, 2013 Author Report Share Posted February 14, 2013 None. They are all divisible by 3 and 9 (the sum of 1 through 9 is 45 and is divisible by 3 and 9) Wow. That was fast. Good job! Quote Link to comment Share on other sites More sharing options...

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## Morningstar

Just a quick math problem that shouldn't take too long.

The digits 0-9 can be arranged into 3,628,800 distinct 10-digit numbers (including a leading 0). Of these, how many are prime?

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