sequences.extras: faster even-indices and odd-indices.
sequences.extras: faster even-indices and odd-indices.

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