From the Project Euler

*Problem 10:
The sum of the primes below 10 is 2 + 3 + 5 + 7 = 17.
Find the sum of all the primes below two million.*

**checked**

A processor Intel® Core™ i7-2720QM CPU @ 2.20GHz × 8 takes about 6 minutes to complete this calculation.

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