61 + 67 + 71 + 73 + 79 = 351
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The sum of all prime numbers between 1 and 11 is 28.
To find the sum of all prime numbers between 20 and 40, we first list out the prime numbers in that range: 23, 29, 31, 37. Then, we simply add them together: 23 + 29 + 31 + 37 = 120. Therefore, the sum of all prime numbers between 20 and 40 is 120.
The prime numbers between 40 and 50 are 41, 43, 47. So their sum is 131.
There are not three prime numbers that have the sum of 3. The smallest prime number is 2. If all three prime numbers were 2, the sum would 2 + 2 + 2 = 6, so that is the smallest number that is the sum of three prime numbers.
11,13,19