Posted by Ian on Monday, April 15, 2013 at 3:12am.
Consider a digital clock. The first time after midnight when the three digits are all prime numbers is 2:22 am. What is the last time before 10:00 am, when the three digits on the clock are all prime numbers?
Details and assumptions
If you determine that the time is 4:23 am, type in 423 as your numerical answer.

MAths  Prem Singh, Monday, April 15, 2013 at 7:51am
757
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