To find the prime factors of any number then divide the number by prime numbers of increasing value. When a Prime number wholly divides the original number repeat the process with the same prime number but each time with the new quotient until complete division does not occur. Repeat with a prime number of higher value until the final quotient is 1.
68 ÷ 2 = 34
34 ÷ 2 = 17
17 ÷ 2 complete division does not occur
17 ÷ 3 complete division does not occur....and this continues with 5,7,11 and 13
17 ÷ 17 = 1 : quotient = 1, factorisation is complete
68 expressed as a product of its prime factors is 2 x 2 x 17 or 22 x 17.
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The sum of the prime numbers 2, 5, and 61 is 68.
2 x 2 x 17 = 68
22 x 17 = 68
Oh, isn't that a happy little question! Let's see, the prime numbers between 30 and 40 are 31, 37. So, if we add them together, we get 68. Just remember, there are no mistakes, only happy accidents in math and painting!
The numbers 53, 59, 61, 67, 71, 73, 79, 83 and 89 are prime.