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FACTOR(6) NetBSD Games Manual FACTOR(6)
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by Kimmo Suominen.
Based on man-cgi by Panagiotis Christias.
factor -- factor a number
factor [-hx] [number ...]
The factor utility factors integers larger than 0. When a number is fac-
tored, it is printed, followed by a ``:'', and the list of (prime) fac-
tors 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 +. Numbers that start with 0x are interpreted as hexadecimal. A
0 input exits the program. Negative numbers are not allowed. 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
The following option is available:
-h If the -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.
-x If the -x flag is specified, factors will be printed in hexadecimal
Out of range or invalid input results in an appropriate error message to
Originally by Landon Curt Noll.
NetBSD 9.99 October 12, 2020 NetBSD 9.99