factor, primes - factor a number, generate primes
factor [number ...]
primes [start [stop]]
The factor utility will factor 64-bit positive integers.
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
When factor is invoked with no arguments, factor reads numbers, one per
line, from standard input, until end of file or error.
empty lines are ignored. Numbers may be preceded by a single +. After a
number is read, it is factored. Input lines must not be
longer than 99
The primes utility prints primes in ascending order, one per
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
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 input line must not be longer
than 99 characters.
factor cannot handle the ``10 most wanted'' factor list;
primes won't get
you a world record.
OpenBSD 3.6 May 31, 1993
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