odd_1:  2 wallclock secs ( 1.70 usr +  0.00 sys =  1.70 CPU) @ 586854.46/s (n=1000000)
odd_2:  3 wallclock secs ( 1.67 usr +  0.00 sys =  1.67 CPU) @ 598086.12/s (n=1000000)