project-euler.150: 20% faster.
project-euler.150: 20% faster.

bjourne/factor,bpollack/factor,AlexIljin/factor,bpollack/factor,tgunr/factor,slavapestov/factor,AlexIljin/factor,factor/factor,nicolas-p/factor,bjourne/factor,nicolas-p/factor,AlexIljin/factor,mrjbq7/factor,tgunr/factor,sarvex/factor-lang,dch/factor,factor/factor,mrjbq7/factor,dch/factor,bjourne/factor,AlexIljin/factor,factor/factor,AlexIljin/factor,bpollack/factor,nicolas-p/factor,tgunr/factor,mrjbq7/factor,bjourne/factor,slavapestov/factor,dch/factor,sarvex/factor-lang,slavapestov/factor,slavapestov/factor,sarvex/factor-lang,sarvex/factor-lang,bpollack/factor,tgunr/factor,bjourne/factor,bpollack/factor,bpollack/factor,nicolas-p/factor,tgunr/factor,mrjbq7/factor,dch/factor,mrjbq7/factor,dch/factor,factor/factor,nicolas-p/factor,sarvex/factor-lang,tgunr/factor,factor/factor,slavapestov/factor,sarvex/factor-lang,slavapestov/factor,bjourne/factor,dch/factor,AlexIljin/factor,nicolas-p/factor,AlexIljin/factor,bpollack/factor,sarvex/factor-lang,nicolas-p/factor,mrjbq7/factor,bjourne/factor,factor/factor,slavapestov/factor