FACTOR(6) MidnightBSD Games Manual FACTOR(6)

**NAME**

**factor**, **primes** —
factor a number, generate primes

**SYNOPSIS**

**factor** [**−h**]
[*number ...*] **
primes** [

**DESCRIPTION**

The **factor** utility will factor
positive integers. When a number is factored, it is printed,
followed by a ‘&:’, and the list of factors on a
single line. Factors are listed in ascending order, and are
preceded by a space. If a factor divides a value more than once, it
will be printed more than once.

When **factor** is
invoked with one or more arguments, each argument will be
factored.

When **factor** is
invoked with no arguments, **factor** reads numbers, one per
line, from standard input, until end of file or error. Leading
white-space and empty lines are ignored. Numbers may be preceded by
a single ‘+’. Numbers are terminated by a non-digit
character (such as a newline). After a number is read, it is
factored.

The **primes**
utility prints primes in ascending order, one per line, starting at
or above *start* and continuing until, but not including
*stop*. The *start* value must be at least 0 and not
greater than *stop*. The *stop* value must not be greater
than the maximum. The default and maximum value of *stop* is
4294967295 on 32-bit architectures and 18446744073709551615 on
64-bit ones.

When the **primes**
utility is invoked with no arguments, *start* is read from
standard input and *stop* is taken to be the maximum. The
*start* value may be preceded by a single ‘+’. The
*start* value is terminated by a non-digit character (such as
a newline).

**DIAGNOSTICS**

**negative numbers aren’t
permitted
illegal numeric format
start value must be less than stop value
Result too large **

**BUGS**

**factor** cannot handle the
‘‘10 most wanted’’ factor list,
**primes** will not get you a world record.

MidnightBSD 0.3 October 10, 2002 MidnightBSD 0.3