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FACTOR(6)                      BSD Games Manual                      FACTOR(6)

     factor -- factor a number

     factor [number ...]

     The 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.  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.  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.

     Out of range or invalid input results in an appropriate error message
     being written to standard error.

BSD                              May 15, 2010                              BSD