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. Neither the name of the University nor the names of its contributors 16.\" may be used to endorse or promote products derived from this software 17.\" without specific prior written permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29.\" SUCH DAMAGE. 30.\" 31.\" @(#)factor.6 8.1 (Berkeley) 5/31/93 32.\" 33.\" $FreeBSD: src/games/factor/factor.6,v 1.5.2.3 2003/01/26 02:54:56 keramida Exp $ 34.\" $DragonFly: src/games/factor/factor.6,v 1.3 2005/08/05 22:35:10 swildner Exp $ 35.\" 36.\" By: Landon Curt Noll chongo@toad.com, ...!{sun,tolsoft}!hoptoad!chongo 37.\" 38.\" chongo <for a good prime call: 391581 * 2^216193 - 1> /\oo/\ 39.\" 40.Dd October 10, 2002 41.Dt FACTOR 6 42.Os 43.Sh NAME 44.Nm factor , 45.Nm primes 46.Nd factor a number, generate primes 47.Sh SYNOPSIS 48.Nm 49.Op Fl h 50.Op Ar number ... 51.Nm primes 52.Op Fl h 53.Op Ar start Op Ar stop 54.Sh DESCRIPTION 55The 56.Nm 57utility will factor positive integers. 58When a number is factored, it is printed, followed by a 59.Ql \&: , 60and the list of factors on a single line. 61Factors are listed in ascending order, and are preceded by a space. 62If a factor divides a value more than once, it will be printed more than once. 63.Pp 64When 65.Nm 66is invoked with one or more arguments, each argument will be factored. 67.Pp 68When 69.Nm 70is invoked with no arguments, 71.Nm 72reads numbers, one per line, from standard input, until end of file or error. 73Leading white-space and empty lines are ignored. 74Numbers may be preceded by a single 75.Ql + . 76Numbers are terminated by a non-digit character (such as a newline). 77After a number is read, it is factored. 78.Pp 79The 80.Nm primes 81utility prints primes in ascending order, one per line, starting at or above 82.Ar start 83and continuing until, but not including 84.Ar stop . 85The 86.Ar start 87value must be at least 0 and not greater than 88.Ar stop . 89The 90.Ar stop 91value must not be greater than the maximum. 92The default and maximum value of 93.Ar stop 94is 4294967295 on 32-bit architectures 95and 18446744073709551615 on 64-bit ones. 96.Pp 97When the 98.Nm primes 99utility is invoked with no arguments, 100.Ar start 101is read from standard input and 102.Ar stop 103is taken to be the maximum. 104The 105.Ar start 106value may be preceded by a single 107.Ql + . 108The 109.Ar start 110value is terminated by a non-digit character (such as a newline). 111.Sh DIAGNOSTICS 112.Bl -diag 113.It "negative numbers aren't permitted" 114.It "illegal numeric format" 115.It "start value must be less than stop value" 116.It "Result too large" 117.El 118.Sh BUGS 119.Nm 120cannot handle the 121.Dq "10 most wanted" 122factor list, 123.Nm primes 124will not get you a world record. 125