ref: 2ea66b170147f66e05cd82da83b795cf4d660e26
dir: /sys/man/1/factor/
.TH FACTOR 1 .CT 1 numbers .SH NAME factor, primes \- factor a number, generate large primes .SH SYNOPSIS .B factor [ .I number ] .PP .B primes .I start [ .I finish ] .SH DESCRIPTION .I Factor prints .I number and its prime factors, each repeated the proper number of times. The number must be positive and less than .if n 2**54 .if t 2\u\s754\s0\d (about .if n 1.8e16) .if t 1.8\(mu10\u\s716\s0\d\|). .PP If no .I number is given, .I 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 .if n sqrt(n). .if t .I \(sr\o'n\(rn'\f1. .PP .PP .I Primes prints the prime numbers ranging from .I start to .IR finish , where .I start and .I finish are positive numbers less than .if n 2**56. .if t 2\u\s756\s0\d. If .I finish is missing, .I primes prints without end; if .I start is missing, it reads the starting number from the standard input. .SH SOURCE .B /sys/src/cmd/factor.c .br .B /sys/src/cmd/primes.c