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Earn +20 ptsQ: How many two-digit primes have the sum of the digits equal to 8?
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How many prime numbers from 11 to 100 are there whose digits when interchanged give a prime number?
There are four pair of mirror primes.
How many primes are less than 100?
There 25 primes 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.
How many pairs of coprime primes are there between 1 and 50?
All pairs of two primes are coprime. There are fifteen primes under 50. So that means there are 105 unique pairs of "coprime primes", or more generally, pairs of primes, under 50.
How many twin primes are there in 135-145?
One pair of twin primes between 135 and 145
How many significant digits are in How many significant digits are in 74.30?
4
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