Brain Teasers
Prime Date
When was the last time all the digits in the date (dd-mm-yyyy) were a prime number? When will the next one be? Notice that it is simply digits, and not the whole number.
Ignore any leading zeroes.
Ignore any leading zeroes.
Answer
The last time all the digits in the date (dd-mm-yyyy) were a prime number was on 27-7-777 and the next one will be on 2-2-2222.Note that 1 is not a Prime number. And single digit prime numbers are 2, 3, 5 and 7.
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