1 files changed, 27 insertions, 0 deletions
diff --git a/challenge-156/cheok-yin-fung/perl/ch-1.pl b/challenge-156/cheok-yin-fung/perl/ch-1.pl
new file mode 100644
index 0000000000..82b1555505
--- /dev/null
+++ b/challenge-156/cheok-yin-fung/perl/ch-1.pl
@@ -0,0 +1,27 @@
+#!/usr/bin/perl
+use v5.22.0;
+use warnings;
+use Math::Prime::Util qw 'is_prime';
+
+my $N = $ARGV[0] || 10;
+
+my $count = 0;
+
+for (1..3*$N) {
+    if (pernicious_simple($_)) {
+        say $_;
+        $count++;
+    }
+    last if $count == $N;
+}
+
+die "bound too small\n" if $count < $N;
+
+
+
+sub pernicious_simple {
+    my $num = $_[0];
+    my $count_one = scalar 
+                      grep { $_ == 1 } split "", sprintf("%b",$num);
+    return is_prime($count_one) ? 1 : 0;
+}