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35 .\" @(#)factor.6 8.1 (Berkeley) 5/31/93
39 .\" By: Landon Curt Noll chongo@toad.com, ...!{sun,tolsoft}!hoptoad!chongo
41 .\" chongo <for a good prime call: 391581 * 2^216193 - 1> /\oo/\
43 .TH FACTOR 6 "Jan 7, 1999"
46 factor, primes \- factor a number, generate primes
52 -[h] [ start [ stop ]]
56 utility will factor integers between 0 and ULONG_MAX (4294967295 on 32
57 bit architectures, 18446744073709551615 on 64 bit ones), inclusive.
58 When a number is factored, it is printed, followed by a ``:'',
59 and the list of factors on a single line.
60 Factors are listed in ascending order, and are preceded by a space.
61 If a factor divides a value more than once, it will be printed
66 is invoked with one or more arguments,
67 each argument will be factored.
71 is invoked with no arguments,
73 reads numbers, one per line, from standard input, until end of file or error.
74 Leading white-space and empty lines are ignored.
75 Numbers may be preceded by a single - or +.
76 Numbers are terminated by a non-digit character (such as a newline).
77 After a number is read, it is factored.
78 Input lines must not be longer than 255 characters.
82 utility prints primes in ascending order, one per line, starting at or above
84 and continuing until, but not including
88 value must be at least 0 and not greater than
92 value must not be greater than 4294967295.
99 utility is invoked with no arguments,
101 is read from standard input.
103 is taken to be 4294967295.
106 value may be preceded by a single +.
109 value is terminated by a non-digit character (such as a newline).
110 The input line must not be longer than 255 characters.
115 Print the results in hexadecimal rather than decimal.
117 Out of range or invalid input results in `ouch' being
118 written to standard error.
121 cannot handle the ``10 most wanted'' factor list,
123 won't get you a world record.