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47 + 74 = 121

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Q: What is the sum of the greatest prime number less than 50 and the same number with the digits reversed?

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The number is 23.

As of 2013, 17,425,170 digits.

The answer is 1. The smallest prime is 2 and the greatest prime (of however many digits) must be odd. The remainder of ANY odd number when divided by 2 must be 1.

Prime numbers that are still prime after their digits are reversed, like (13,31)(17,71)(37,73)(79,97)(107,701)(113,311)

one is 17 and 71, another one is 11,

A prime number with identical digits is 11.

Mirror primes are pairs of prime numbers whose digits are reversed. (13,31)(17,71)(37,73)(79,97)

Some of them are: 11 13 17 37 and 79

The number 11 is prime and has two identical digits.

13,31 17,71 37,73 79,97

There is no greatest prime number.

8243 is a prime number, but there is no greatest prime number.