A particularly simple approach is: 

use List::Util qw( shuffle );
my @picks = (shuffle 1..15)[0..4];

[download]

For picking a few numbers from a very long list, "rerolling" duplicates is probably the most efficient: 

my @picks;
my %seen;
for (1..5) {                          # Five numbers
   my $pick = int(rand(15000)) + 1;   # in 1..15000.
   redo if $seen{$pick}++;
   push @picks, $pick;
}

[download]
Update: Added second method.

In reply to Re: random number generation. by ikegami
in thread random number generation. by newbio

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