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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