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diff --git a/challenge-169/luca-ferrari/raku/ch-2.p6 b/challenge-169/luca-ferrari/raku/ch-2.p6
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+#!raku
+
+# Perl Weekly Challenge 169
+
+sub compute-factors( $num ) {
+    my $number = $num;
+    my @factors;
+
+    for 2  ..^ $number {
+        next if ! $_.is-prime;
+
+        while ( $number %% $_ ) {
+            @factors.push: $_;
+            $number /= $_;
+        }
+    }
+
+    return @factors;
+}
+
+
+sub is-achille( $num )
+{
+    my Bag $bag = Bag.new: compute-factors( $num );
+    return False if $bag.keys.elems <= 1;
+    return $bag.values.min >= 2 && ( [gcd] $bag.values ) == 1;
+}
+
+sub MAIN( Int $limit where { $limit > 0 } = 20 ) {
+
+    my @achille = lazy gather {
+      take $_ if is-achille( $_ ) for 1 .. Inf;
+    };
+
+    @achille[ 0 .. $limit ].join( "\n" ).say;
+
+}