Benchmark: timing 50000 iterations of 1, 2, 3, 4, 5, 6, 7, 8...
1:  4 wallclock secs ( 4.55 usr +  0.03 sys =  4.58 CPU) @ 10917.03/s (n=50000)
2:  5 wallclock secs ( 4.51 usr +  0.03 sys =  4.54 CPU) @ 11013.22/s (n=50000)
3:  5 wallclock secs ( 4.53 usr +  0.03 sys =  4.56 CPU) @ 10964.91/s (n=50000)
4:  4 wallclock secs ( 4.54 usr +  0.03 sys =  4.57 CPU) @ 10940.92/s (n=50000)
5:  5 wallclock secs ( 4.52 usr +  0.06 sys =  4.58 CPU) @ 10917.03/s (n=50000)
6:  5 wallclock secs ( 4.52 usr +  0.00 sys =  4.52 CPU) @ 11061.95/s (n=50000)
7:  4 wallclock secs ( 4.34 usr +  0.01 sys =  4.35 CPU) @ 11494.25/s (n=50000)
8:  5 wallclock secs ( 4.31 usr +  0.04 sys =  4.35 CPU) @ 11494.25/s (n=50000)