Q: What is the sum of the prime numbers betwween 40 and 70?

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31 is the only prime number between 30 and 40

Two prime numbers can have only one sum, not three different sums!

391

120

37 + 3

23 times 5

68

The prime numbers between 40 and 50 are 41, 43, 47. So their sum is 131.

17, 23.

3 + 37 = 4011 + 29 = 4017 + 23 = 40

2, 7 and 31 add up to 40.

The sum is: 23+29+31+37 = 120