Q: What are all the two digit prime numbers neither of whose digits are prime?

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73 is the largest two-digit number that is prime and has prime numbers for both of its digits.

73 is the largest 2 digit number that is both prime and has prime numbers for both of its digits.

You had me until "product." The product of 4 digits can't be prime.

Two-digit prime numbers whose digits add up to 10 are:193773

there are 4

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73 is the largest two-digit number that is prime and has prime numbers for both of its digits.

73 is the largest 2 digit number that is both prime and has prime numbers for both of its digits.

You had me until "product." The product of 4 digits can't be prime.

Two-digit prime numbers whose digits add up to 10 are:193773

there are 4

Smallest is 11 & Largest is 77.

It would probably refer to a digit that is a prime number, or a composite number. Note that mathematicians normally talk about prime and composite NUMBERS, not individual digits.

73 satisfies your condition.

Any prime numbers of about 66 or 67 digits will do.

Any two prime numbers, of about 200 digits each, would work.Any two prime numbers, of about 200 digits each, would work.Any two prime numbers, of about 200 digits each, would work.Any two prime numbers, of about 200 digits each, would work.

3 41 43 47

The smallest two-digit prime number whose digits themselves are prime is 23. Both 2 and 3 are prime numbers, and together they form the prime number 23.