Q: How many two digit prime numbers are there?

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

there are 4

There are 5 of them.

679 is the product of the largest single-digit prime number and the largest two-digit prime number.

There are only two prime numbers that are consecutive numbers, 2 and 3. Their product is 2 x 3 = 6. The first prime numbers are 2, 3, 5, and 7 and the only two consecutive prime numbers whose product is a single digit are 2 and 3. (The next two consecutive prime numbers, 3 and 5, have a two-digit product.)

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17, 37, 47, 67, 97

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

there are 4

There are 5 of them.

3 numbers 2, 23 and 29

679 is the product of the largest single-digit prime number and the largest two-digit prime number.

There can only be one largest two-digit prime number.

There are only two prime numbers that are consecutive numbers, 2 and 3. Their product is 2 x 3 = 6. The first prime numbers are 2, 3, 5, and 7 and the only two consecutive prime numbers whose product is a single digit are 2 and 3. (The next two consecutive prime numbers, 3 and 5, have a two-digit product.)

13, 23, 43, 53, 73 & 83

61 42 56 89

The first five two-digit prime numbers are 11, 13, 17, 19, and 23.

For a 2-digit prime number (which are all odd) to be the sum of two prime numbers, one of the prime numbers will have to be 2. That means the difference between the sum and the other addend will have to be 2. Prime numbers that differ by 2 are called twin primes. There are six pairs of 2-digit twin primes. Your numbers are 13, 19, 31, 43, 61 and 73.