Posted by Diana on Tuesday, March 15, 2011 at 8:11am.
Find all the two digit prime numbers neither of whose digits are prime.
Someone helped me yesterday but I do not understand.

math  MathMate, Tuesday, March 15, 2011 at 8:24am
You need a list of all digits which are not prime:
1,4,6,8,9
(Note that 1 is not considered a prime).
From a list of prime number from 1 to 100, find the primes that are made up of one or both of these 5 digits. For example, 11 is a prime number made up of digits (1 and 1) that are not prime.
List of prime numbers less than 100
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97

math  mark, Wednesday, October 30, 2013 at 7:12pm
For how many two digit prime numbers is the sum of its digits 8
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