#!/usr/bin/perl -040l

# http://perlmonks.org/?node_id=1197777

use strict;
use warnings;

my @alphabet = (0..9, 'a'..'z');
my %next;
@next{@alphabet} = @alphabet[1..$#alphabet];

$_ = '0zyw'; # let's start at some place interesting

for my $n ( 1..200 )
  {
  print;
  s/(.)(z*)$/ $next{$1} . $2 =~ tr!z!0!r /e; # advance
  }
[download]

Prints:

0zyw 0zyx 0zyy 0zyz 0zz0 0zz1 0zz2 0zz3 0zz4 0zz5 0zz6 0zz7 0zz8 0zz9 
+0zza 0zzb 0zzc 0zzd 0zze 0zzf 0zzg 0zzh 0zzi 0zzj 0zzk 0zzl 0zzm 0zzn
+ 0zzo 0zzp 0zzq 0zzr 0zzs 0zzt 0zzu 0zzv 0zzw 0zzx 0zzy 0zzz 1000 100
+1 1002 1003 1004 1005 1006 1007 1008 1009 100a 100b 100c 100d 100e 10
+0f 100g 100h 100i 100j 100k 100l 100m 100n 100o 100p 100q 100r 100s 1
+00t 100u 100v 100w 100x 100y 100z 1010 1011 1012 1013 1014 1015 1016 
+1017 1018 1019 101a 101b 101c 101d 101e 101f 101g 101h 101i 101j 101k
+ 101l 101m 101n 101o 101p 101q 101r 101s 101t 101u 101v 101w 101x 101
+y 101z 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 102a 102b 10
+2c 102d 102e 102f 102g 102h 102i 102j 102k 102l 102m 102n 102o 102p 1
+02q 102r 102s 102t 102u 102v 102w 102x 102y 102z 1030 1031 1032 1033 
+1034 1035 1036 1037 1038 1039 103a 103b 103c 103d 103e 103f 103g 103h
+ 103i 103j 103k 103l 103m 103n 103o 103p 103q 103r 103s 103t 103u 103
+v 103w 103x 103y 103z 1040 1041 1042 1043 1044 1045 1046 1047 1048 10
+49 104a 104b 104c 104d 104e 104f
[download]