Simple Go benchmark for testing
#Sample results: #i5 2500K @ 4.0Ghz 3957809 1 46423520800 ns/op
3957809 1 1102586688354 ns/op
3957809 1 1113241230692 ns/op
#explanation 3957809:prime numbers 1 46423520800 ns/op means that the loop ran 1 time at a speed of 46423520800 ns per loop.