1.\" Copyright (c) 1989, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" Landon Curt Noll. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. All advertising materials mentioning features or use of this software 16.\" must display the following acknowledgement: 17.\" This product includes software developed by the University of 18.\" California, Berkeley and its contributors. 19.\" 4. Neither the name of the University nor the names of its contributors 20.\" may be used to endorse or promote products derived from this software 21.\" without specific prior written permission. 22.\" 23.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33.\" SUCH DAMAGE. 34.\" 35.\" @(#)factor.6 8.1 (Berkeley) 5/31/93 36.\" 37.\" $FreeBSD: src/games/factor/factor.6,v 1.5.2.3 2003/01/26 02:54:56 keramida Exp $ 38.\" $DragonFly: src/games/factor/factor.6,v 1.2 2003/06/17 04:25:23 dillon Exp $ 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 October 10, 2002 45.Dt FACTOR 6 46.Os 47.Sh NAME 48.Nm factor , primes 49.Nd factor a number, generate primes 50.Sh SYNOPSIS 51.Nm 52.Op Fl h 53.Op Ar number ... 54.Nm primes 55.Op Fl h 56.Op Ar start Op Ar stop 57.Sh DESCRIPTION 58The 59.Nm 60utility will factor positive integers. 61When a number is factored, it is printed, followed by a 62.Ql \&: , 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 more than once. 66.Pp 67When 68.Nm 69is invoked with one or more arguments, each argument will be factored. 70.Pp 71When 72.Nm 73is invoked with no arguments, 74.Nm 75reads numbers, one per line, from standard input, until end of file or error. 76Leading white-space and empty lines are ignored. 77Numbers may be preceded by a single 78.Ql + . 79Numbers are terminated by a non-digit character (such as a newline). 80After a number is read, it is factored. 81.Pp 82The 83.Nm primes 84utility prints primes in ascending order, one per line, starting at or above 85.Ar start 86and continuing until, but not including 87.Ar stop . 88The 89.Ar start 90value must be at least 0 and not greater than 91.Ar stop . 92The 93.Ar stop 94value must not be greater than the maximum. 95The default and maximum value of 96.Ar stop 97is 4294967295 on 32-bit architectures 98and 18446744073709551615 on 64-bit ones. 99.Pp 100When the 101.Nm primes 102utility is invoked with no arguments, 103.Ar start 104is read from standard input and 105.Ar stop 106is taken to be the maximum. 107The 108.Ar start 109value may be preceded by a single 110.Ql + . 111The 112.Ar start 113value is terminated by a non-digit character (such as a newline). 114.Sh DIAGNOSTICS 115.Bl -diag 116.It "negative numbers aren't permitted" 117.It "illegal numeric format" 118.It "start value must be less than stop value" 119.It "Result too large" 120.El 121.Sh BUGS 122.Nm 123cannot handle the 124.Dq "10 most wanted" 125factor list, 126.Nm primes 127will not get you a world record. 128