A prime
How many primes exist between 1 and inclusive for which is prime?
The answer is 0.
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1 solution
An odd number to any power (greater than 0) is odd, as it does not have the factor 2. An odd number added to an odd number is even. Each even number has the factor 2 and is therefore except for 2 itself, not prime. 2 4 + 5 = 2 1 = 7 × 3 Therefore there exists no such number.