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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 $Mdocdate: January 24 2011 $ .Dt FACTOR 6 .Os .Sh NAME .Nm factor , .Nm primes .Nd factor a number, generate primes .Sh SYNOPSIS .Nm factor .Op Ar number ... .Nm primes .Op Ar start Op Ar stop .Sh DESCRIPTION The .Nm utility will factor 64-bit positive integers. When a number is factored, it is printed, followed by a .Sq : , and the list of its prime factors in ascending order, on a single line. Every prime factor is printed as often as it divides the number.
p When .Nm is invoked with one or more arguments, each argument will be factored.
p When .Nm is invoked with no arguments, .Nm reads numbers, one per line, from standard input, until end of file or error. White-space and empty lines are ignored. Numbers may be preceded by a single +. After a number is read, it is factored. Input lines must not be longer than 99 characters.
p The .Nm primes 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 4294967295. The default value of .Ar stop is 4294967295.
p When the .Nm primes utility is invoked with no arguments, .Ar start is read from standard input. .Ar stop is taken to be 4294967295. The .Ar start value may be preceded by a single +. The input line must not be longer than 99 characters. .Sh BUGS .Nm factor cannot handle the .Dq 10 most wanted factor list; .Nm primes won't get you a world record.