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Earn +20 ptsQ: What prime numbers are still prime numbers when their digits are reversed?
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What are reversed prime numbers?
Prime numbers that are still prime after their digits are reversed, like (13,31)(17,71)(37,73)(79,97)(107,701)(113,311)
How many two-digit prime numbers can you find that are still prime when you reverse the digits?
61 42 56 89
What are the prime numbers between 10 and 100 that are still prime when reversed?
11 13 17 31 37 71 73 79 97
Was the sum of all prime numbers?
Prime numbers with hundreds of digits have been found, but there are still more to come that haven't been found yet. It's not possible to add up all the prime numbers, because nobody knows what they all are yet. Since there is no last prime number (this was proved 2000 years ago by Euclid), the sum of all prime numbers is infinite.
Are prime numbers still prime in non ten digit counting systems?
Yes. Being a prime number has nothing to do with the decimal system.
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