.CT 1 numbers factor, primes - factor a number, generate large primes factor [ number ]

primes [ start [ finish ] ]

Factor prints number and its prime factors, each repeated the proper number of times. The number must be positive and less than (about

If no number is given, factor reads a stream of numbers from the standard input and factors them. It exits on any input not a positive integer. Maximum running time is proportional to

Lfactor reads one number from the standard input and factors it. Worst-case running time is proportional to it beats factor for hard 12-digit problems and is workable to around ..

Primes prints the prime numbers ranging from start to finish , where start and finish are positive numbers less than If finish is missing, primes prints without end; if start is missing, it reads the starting number from the standard input.

/sys/src/cmd/factor.c

/sys/src/cmd/primes.c