.\"	$NetBSD: primes.6,v 1.3 2008/02/03 03:29:17 wiz Exp $
.\"
.\" Copyright (c) 1989, 1993
.\"	The Regents of the University of California.  All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" Landon Curt Noll.
.\"
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.\" modification, are permitted provided that the following conditions
.\" are met:
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.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
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.\" 3. Neither the name of the University nor the names of its contributors
.\"    may be used to endorse or promote products derived from this software
.\"    without specific prior written permission.
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.\"	@(#)factor.6	8.1 (Berkeley) 5/31/93
.\"
.\"
.\" By: Landon Curt Noll   chongo@toad.com,   ...!{sun,tolsoft}!hoptoad!chongo
.\"
.\"   chongo <for a good prime call: 391581 * 2^216193 - 1> /\oo/\
.\"
.Dd February 3, 2008
.Dt PRIMES 6
.Os
.Sh NAME
.Nm primes
.Nd generate primes
.Sh SYNOPSIS
.Nm primes
.Op Fl d
.Op Ar start Op Ar stop
.Sh DESCRIPTION
The
.Nm
utility prints primes in ascending order, one per line, starting
at or above
.Ar start
and continuing until, but not including
.Ar stop .
The
.Ar start
value must be at least 0 and not greater than
.Ar stop .
The
.Ar stop
value must not be greater than
the maximum possible value of unsigned integer types on your system
(4294967295 for 32-bit systems and
18446744073709551615 for 64-bit systems).
The default value of
.Ar stop
is 4294967295 on 32-bit and 18446744073709551615 on 64-bit.
.Pp
When the
.Nm
utility is invoked with no arguments,
.Ar start
is read from standard input.
.Ar stop
is taken to be 4294967295 on 32-bit and 18446744073709551615 on 64-bit.
The
.Ar start
value may be preceded by a single
.Sq \&+ .
The
.Ar start
value is terminated by a non-digit character (such as a newline).
The input line must not be longer than 255 characters.
When given the
.Fl d
argument,
.Nm
prints the difference between the current and the previous prime.
.Sh DIAGNOSTICS
Out of range or invalid input results in
an appropriate error message
being written to standard error.
.Sh BUGS
.Nm
won't get you a world record.