primes/primes.6

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   6 .\" This code is derived from software contributed to Berkeley by
   7 .\" Landon Curt Noll.
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  32 .\"
  33 .\"     @(#)factor.6    8.1 (Berkeley) 5/31/93
  34 .\"
  35 .\"
  36 .\" By Landon Curt Noll, http://www.isthe.com/chongo/index.html /\oo/\
  37 .\"
  38 .Dd February 2, 2018
  39 .Dt PRIMES 6
  40 .Os
  41 .Sh NAME
  42 .Nm primes
  43 .Nd generate primes
  44 .Sh SYNOPSIS
  45 .Nm primes
  46 .Op Fl dh
  47 .Op Ar start Op Ar stop
  48 .Sh DESCRIPTION
  49 The
  50 .Nm
  51 utility prints primes in ascending order, one per line, starting
  52 at or above
  53 .Ar start
  54 and continuing until, but not including
  55 .Ar stop .
  56 The
  57 .Ar start
  58 value must be at least 0 and not greater than
  59 .Ar stop .
  60 The
  61 .Ar stop
  62 value must not be greater than 3825123056546413050.
  63 The default value of
  64 .Ar stop
  65 is 3825123056546413050.
  66 .Pp
  67 When the
  68 .Nm
  69 utility is invoked with no arguments,
  70 .Ar start
  71 is read from standard input and
  72 .Ar stop
  73 is taken to be 3825123056546413050.
  74 The
  75 .Ar start
  76 value may be preceded by a single
  77 .Sq \&+ .
  78 The
  79 .Ar start
  80 value is terminated by a non-digit character (such as a newline).
  81 The input line must not be longer than 255 characters.
  82 .Pp
  83 When given the
  84 .Fl d
  85 argument,
  86 .Nm
  87 prints the difference between the current and the previous prime.
  88 .Pp
  89 When given the
  90 .Fl h
  91 argument,
  92 .Nm
  93 prints the prime numbers in hexadecimal.
  94 .Sh DIAGNOSTICS
  95 Out of range or invalid input results in
  96 an appropriate error message to standard error.
  97 .Sh AUTHORS
  98 .An -nosplit
  99 Originally by
 100 .An Landon Curt Noll ,
 101 extended to some 64-bit primes by
 102 .An Colin Percival .
 103 .Sh BUGS
 104 This
 105 .Nm
 106 program won't get you a world record.