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.

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**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

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**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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