ps and is there a name for this sort of number?
prime number question
Sort:
Please Sign Up to comment.
If you need help, please contact our Help and Support team.
it's my birthdy (yes, really) and I'm 47
. obviously it's a prime but 4+7 is also prime and the digits of that prime(1 and 1) also add up to a prime. When will my next birthday have such properties?