factor man page on HP-UX

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factor(1)							     factor(1)

       factor, primes - factor a number, generate large primes



       If no arguments are provided on the command line, waits for a number to
       be typed in.  If a positive number is typed, it factors the number  and
       print  its  prime  factors;  each  one  is printed the proper number of
       times.  It then waits for another number.  exits	 if  it	 encounters  a
       zero or any non-numeric character.

       If  an  argument is provided on the command line, factors the number as
       above, then exits.

       Maximum time to factor is proportional to sqrt(n) and occurs when n  is
       prime or the square of a prime.

       The largest number that can be dealt with by is 1.0e14.

       prints  prime numbers between a lower and upper bound.  If no arguments
       are provided on the command line, waits for two numbers to be typed in.
       The  first  number is interpreted as the lower bound; the second as the
       upper bound.  All prime numbers in the resulting	 inclusive  range  are

       If  start  is  specified, all primes greater than or equal to start are
       printed.	 If both start and stop are given, all primes occurring in the
       inclusive range start through stop are printed.

       start and stop values must be integers represented as long integers.

       If the stop value is omitted in either case, runs either until overflow
       occurs or until it is stopped by typing the interrupt character.

       The largest number that can be dealt with by is	2,147,483,647.

       Both commands print when the input is out of range, illegal  characters
       are encountered, or when start is greater than stop.

       Print the prime factorization for the number 12:

       Print all prime numbers between 0 and 20:


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