math.integers: use must-fail instead of ignore-errors.
math.integers: use must-fail instead of ignore-errors.

bpollack/factor,bpollack/factor,bjourne/factor,mrjbq7/factor,bpollack/factor,AlexIljin/factor,bpollack/factor,bjourne/factor,AlexIljin/factor,factor/factor,tgunr/factor,factor/factor,bpollack/factor,factor/factor,factor/factor,mrjbq7/factor,AlexIljin/factor,bpollack/factor,tgunr/factor,bjourne/factor,AlexIljin/factor,tgunr/factor,tgunr/factor,factor/factor,tgunr/factor,mrjbq7/factor,tgunr/factor,AlexIljin/factor,bjourne/factor,mrjbq7/factor,mrjbq7/factor,mrjbq7/factor,factor/factor,AlexIljin/factor,AlexIljin/factor,bpollack/factor,bjourne/factor,bjourne/factor,bjourne/factor