FACTOR(6) | Games Manual | FACTOR(6) |
factor
—
factor |
[-h ] [number ...] |
factor
utility factors integers larger than 1. When
a number is factored, it is printed, followed by a “:”, and the
list of (prime) factors on a single line. Factors are listed in ascending
order, and are preceded by a space. By default, if a factor divides a value
more than once, it will be printed more than once.
When factor
is invoked with one or more
number arguments, each argument will be factored.
When factor
is invoked with no
number arguments, factor
reads
numbers, one per line, from standard input, until end of file or error.
Leading white-space and empty lines are ignored. Numbers may be preceded by
a single +. Integer less than 2 are rejected. Numbers are terminated by a
non-digit character (such as a newline). After a number is read, it is
factored. Input lines must not be longer than LINE_MAX -
1
(currently 2047) characters.
By default, factor
is compiled against the
OpenSSL bignum implementation
openssl_bn(3), which lets
it handle arbitrarily large values. (Note however that very large values can
take a very long time to factor.) If factor
is
compiled without OpenSSL it is limited to the maximum value of
unsigned long.
The following option is available:
-h
-h
flag is specified, factors will be
printed in "human-readable" format. If a factor x divides a
value n (>1) times, it will appear as x^n.Nov 12, 2017 | NetBSD 9.2 |