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diff --git a/challenge-167/luca-ferrari/raku/ch-1.p6 b/challenge-167/luca-ferrari/raku/ch-1.p6
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+#!raku
+
+# Perl Weekly Challenge 167
+
+sub is-circular-prime( Int $prime )
+{
+    return False if ! $prime.is-prime;
+
+    my @digits = $prime.comb;
+    my $found = True;
+    for 1 ..^ @digits.elems {
+        return False if ! ( |@digits[ $_ .. * - 1], |@digits[ 0 .. $_ - 1 ] ).join.Int.is-prime;
+    }
+
+    return True;
+}
+
+
+sub MAIN() {
+    (100 .. 999).grep( { is-circular-prime( $_ ) } ).join( "\n" ).say;
+}