1 .TH FACTOR 1 
2 .CT 1 numbers
3 .SH NAME
4 factor, primes \- factor a number, generate large primes
5 .SH SYNOPSIS
6 .B factor
7 [
8 .I number
9 ]
10 .PP
11 .B primes
12 [
13 .I start
14 [
15 .I finish
16 ]
17 ]
18 .SH DESCRIPTION
19 .I Factor
20 prints
21 .I number
22 and its prime factors,
23 each repeated the proper number of times.
24 The number must be positive and less than
25 .if n 2**54
26 .if t 2\u\s754\s0\d
27 (about
28 .if n 1.8e16)
29 .if t 1.8\(mu10\u\s716\s0\d\|).
30 .PP
31 If no
32 .I number 
33 is given,
34 .I factor
35 reads a stream of numbers from the standard input and factors them.
36 It exits on any input not a positive integer.
37 Maximum running time is proportional to
38 .if n sqrt(n).
39 .if t .I \(sr\o'n\(rn'\f1.
40 .PP
41 .PP
42 .I Primes
43 prints the prime numbers ranging from
44 .I start
45 to
46 .IR finish ,
47 where
48 .I start
49 and
50 .I finish
51 are positive numbers less than 
52 .if n 2**56.
53 .if t 2\u\s756\s0\d.
54 If 
55 .I finish
56 is missing,
57 .I primes
58 prints without end;
59 if
60 .I start
61 is missing, it reads the starting number from the
62 standard input.
63 .SH SOURCE
64 .B \*9/src/cmd/factor.c
65 .br
66 .B \*9/src/cmd/primes.c