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FACTOR(1plan9) FACTOR(1plan9)


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 2**54 (about 1.8e16)

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 sqrt(n).

Primes prints the prime numbers ranging from start to finish, where start and finish are positive numbers less than 2**56. If finish is missing, primes prints without end; if start is missing, it reads the starting number from the standard input.