1.\" $OpenBSD: factor.6,v 1.6 2001/06/06 20:52:18 pjanzen Exp $ 2.\" 3.\" Copyright (c) 1989, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" This code is derived from software contributed to Berkeley by 7.\" Landon Curt Noll. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 3. All advertising materials mentioning features or use of this software 18.\" must display the following acknowledgement: 19.\" This product includes software developed by the University of 20.\" California, Berkeley and its contributors. 21.\" 4. Neither the name of the University nor the names of its contributors 22.\" may be used to endorse or promote products derived from this software 23.\" without specific prior written permission. 24.\" 25.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35.\" SUCH DAMAGE. 36.\" 37.\" @(#)factor.6 8.1 (Berkeley) 5/31/93 38.\" 39.\" 40.\" By: Landon Curt Noll chongo@toad.com, ...!{sun,tolsoft}!hoptoad!chongo 41.\" 42.\" chongo <for a good prime call: 391581 * 2^216193 - 1> /\oo/\ 43.\" 44.Dd May 31, 1993 45.Dt FACTOR 6 46.Os 47.Sh NAME 48.Nm factor , 49.Nm primes 50.Nd factor a number, generate primes 51.Sh SYNOPSIS 52.Nm factor 53.Op Ar number ... 54.br 55.Nm primes 56.Op Ar start Op Ar stop 57.Sh DESCRIPTION 58The 59.Nm 60utility will factor integers between -2147483648 and 2147483647 inclusive. 61When a number is factored, it is printed, followed by a 62.Dq \: , 63and the list of factors on a single line. 64Factors are listed in ascending order, and are preceded by a space. 65If a factor divides a value more than once, it will be printed 66more than once. 67.Pp 68When 69.Nm 70is invoked with one or more arguments, 71each argument will be factored. 72.Pp 73When 74.Nm 75is invoked with no arguments, 76.Nm 77reads numbers, one per line, from standard input, until end of file or error. 78Leading white-space and empty lines are ignored. 79Numbers may be preceded by a single - or +. 80Numbers are terminated by a non-digit character (such as a newline). 81After a number is read, it is factored. 82Input lines must not be longer than 255 characters. 83.Pp 84The 85.Nm primes 86utility prints primes in ascending order, one per line, starting at or above 87.Ar start 88and continuing until, but not including 89.Ar stop . 90The 91.Ar start 92value must be at least 0 and not greater than 93.Ar stop . 94The 95.Ar stop 96value must not be greater than 4294967295. 97The default value of 98.Ar stop 99is 4294967295. 100.Pp 101When the 102.Nm primes 103utility is invoked with no arguments, 104.Ar start 105is read from standard input. 106.Ar stop 107is taken to be 4294967295. 108The 109.Ar start 110value may be preceded by a single +. 111The 112.Ar start 113value is terminated by a non-digit character (such as a newline). 114The input line must not be longer than 255 characters. 115.Sh BUGS 116.Nm factor 117cannot handle the 118.Dq 10 most wanted 119factor list; 120.Nm primes 121won't get you a world record. 122