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Earn +20 ptsQ: Sum of all primes less than 100?
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There are 25 prime numbers less than 100 is their sum even or odd?
Oh, what a happy little question! Let's take a look at those prime numbers. When we add them up, we find that their sum is actually even. Isn't that just a delightful surprise? Remember, in the world of numbers, there's always a little bit of magic waiting to be discovered.
What prime number less than 20 can be written as a sum of differrent primes?
2 + 3 = 5
What is the sum of all of the two-digit primes that are greater than 12 but less than 99 and are still prime when their two digits are interchanged?
472.
How many of the prime numbers between 10 and 20 can be written as the sum of two primes?
All prime numbers greater than 2 are odd numbers. For an odd prime to be written as the sum of two primes, one of the primes must be 2 because two odd primes will produce an even sum. 11 cannot be written as the sum of two primes. 13 = 2 + 11. 17 cannot be written as the sum of two primes. 19 = 2 + 17.
What is the prime number is less than 100 and the sum of its digit is 5 if it is 1 less than a multiple of 7?
41
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