I agree that an array would be a much better tool for this job. However, with that said, I'd like to show you how it could be done, if you were dead-set on doing it that way.

use strict;
use warnings;

my $website_1 = 'a';
my $website_2 = 'e';
my $website_3 = 'i';
my $website_4 = 'o';
my $website_5 = 'u';

for (my $x = 1; $x <= 5; $x++) {
    print eval "\$website_$x";
}
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This is neither good nor safe, but I just wanted to show that it was indeed possible.