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Unix Version 7 - man page for factor (v7 section 1)

FACTOR(1)				       General Commands Manual					    FACTOR(1)

NAME
factor, primes - factor a number, generate large primes
SYNOPSIS
factor [ number ] primes
DESCRIPTION
When factor is invoked without an argument, it waits for a number to be typed in. If you type in a positive number less than 256 (about 7.2e16) it will factor the number and print its prime factors; each one is printed the proper number of times. Then it waits for another number. It exits if it encounters a zero or any non- numeric character. If factor is invoked with an argument, it factors the number as above and then exits. Maximum time to factor is proportional to sqrt(n) and occurs when n is prime or the square of a prime. It takes 1 minute to factor a prime near 1014 on a PDP11. When primes is invoked, it waits for a number to be typed in. If you type in a positive number less than 256 it will print all primes greater than or equal to this number.
DIAGNOSTICS
`Ouch.' for input out of range or for garbage input. FACTOR(1)


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