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Q: How many two-digit primes have the sum of the digits equal to 8?
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How many primes are there?

A boatloadThere are in infinite number or primes, and they are still being discovered. The people who discover the prime that has more than 10 million digits will win $100,000. I'm pretty sure they're getting close, something like 9.8 million digits.


How many up numbers of any size have primes only as digits?

An n-digit number has 4^n such numbers.


How many prime numbers from 11 to 100 are there whose digits when interchanged give a prime number?

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How many digits are in 93 million?

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How many three digit numbers have the sum of their digits equal to 22?

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How many primes are there in 1 to 1000?

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