factor, primes  factor a number, generate primes
factor [number ...]
primes [start [stop]]
The factor utility will factor integers between 2147483648 and
2147483647 inclusive. When a number is factored, it is printed, followed
by a ``'', and the list of factors on a single line. Factors are listed
in ascending order, and are preceded by a space. If a factor divides a
value more than once, it will be printed more than once.
When factor is invoked with one or more arguments, each argument will be
factored.
When factor is invoked with no arguments, factor reads numbers, one per
line, from standard input, until end of file or error. Leading whitespace
and empty lines are ignored. Numbers may be preceded by a single 
or +. Numbers are terminated by a nondigit character (such as a newline).
After a number is read, it is factored. Input lines must not be
longer than 255 characters.
The primes utility prints primes in ascending order, one per line, starting
at or above start and continuing until, but not including stop. The
start value must be at least 0 and not greater than stop. The stop value
must not be greater than 4294967295. The default value of stop is
4294967295.
When the primes utility is invoked with no arguments, start is read from
standard input. stop is taken to be 4294967295. The start value may be
preceded by a single +. The start value is terminated by a nondigit
character (such as a newline). The input line must not be longer than
255 characters.
Out of range or invalid input results in `ouch' being written to standard
error.
factor cannot handle the ``10 most wanted'' factor list, primes won't get
you a world record.
BSD May 31, 1993 BSD
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