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Q: What is a two digit prime number with each digit a prime number and the sum a prime number?
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What is the sum ratio of the number of one digit prime numbers and the number of one digit composite numbers?

There are four of each.

What is the greatest 2 digit prime number that each of the 2 digits are prime and the 2 digits sum is prime as well?

The number is 23.

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What two-digit prime number has the sum of its digits that is not 7 but is a multiple of 7?

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What is the sum of all 2-digit multiples of 7 whose digits sum to a prime number?