4 files changed, 64 insertions, 0 deletions
diff --git a/challenge-109/lubos-kolouch/perl/ch-1.pl b/challenge-109/lubos-kolouch/perl/ch-1.pl
new file mode 100644
index 0000000000..16d67eb7d2
--- /dev/null
+++ b/challenge-109/lubos-kolouch/perl/ch-1.pl
@@ -0,0 +1,16 @@
+sub chowla {
+    my ($n) = @_;
+    my $sum = 0;
+    for my $i (2 .. sqrt($n)) {
+        if ($n % $i == 0) {
+            $sum += $i;
+            $sum += $n/$i unless $i == $n/$i;
+        }
+    }
+    return $sum;
+}
+
+for my $n (1 .. 20) {
+    print chowla($n), "\n";
+}
+
diff --git a/challenge-109/lubos-kolouch/perl/ch-2.pl b/challenge-109/lubos-kolouch/perl/ch-2.pl
new file mode 100644
index 0000000000..f0ef66e780
--- /dev/null
+++ b/challenge-109/lubos-kolouch/perl/ch-2.pl
@@ -0,0 +1,18 @@
+use List::Util qw(sum);
+
+my @numbers = (1,2,3,4,5,6,7);
+
+for my $perm (permute(@numbers)) {
+    my ($a, $b, $c, $d, $e, $f, $g) = @$perm;
+    if (sum($a, $b) == sum($b, $c, $d) and sum($b, $c, $d) == sum($d, $e, $f) and sum($d, $e, $f) == sum($f, $g)) {
+        print "a = $a\nb = $b\nc = $c\nd = $d\ne = $e\nf = $f\ng = $g\n";
+        last;
+    }
+}
+
+sub permute {
+    my @items = @_;
+    return [] unless @items;
+    return map { [@items[$_], @$_] } 0..$#items for permute(@items[0..$_-1, $_+1..$#items]) for 0..$#items;
+}
+
diff --git a/challenge-109/lubos-kolouch/python/ch-1.py b/challenge-109/lubos-kolouch/python/ch-1.py
new file mode 100644
index 0000000000..0a72a5859e
--- /dev/null
+++ b/challenge-109/lubos-kolouch/python/ch-1.py
@@ -0,0 +1,18 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+import math
+
+
+def chowla(n):
+    sum = 0
+    for i in range(2, math.isqrt(n) + 1):
+        if n % i == 0:
+            sum += i
+            if i != n//i:
+                sum += n//i
+    return sum
+
+
+for n in range(1, 21):
+    print(chowla(n))
diff --git a/challenge-109/lubos-kolouch/python/ch-2.py b/challenge-109/lubos-kolouch/python/ch-2.py
new file mode 100644
index 0000000000..7e545b4499
--- /dev/null
+++ b/challenge-109/lubos-kolouch/python/ch-2.py
@@ -0,0 +1,12 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+from itertools import permutations
+
+numbers = [1, 2, 3, 4, 5, 6, 7]
+
+for perm in permutations(numbers):
+    a, b, c, d, e, f, g = perm
+    if sum([a, b]) == sum([b, c, d]) == sum([d, e, f]) == sum([f, g]):
+        print(f"a = {a}\nb = {b}\nc = {c}\nd = {d}\ne = {e}\nf = {f}\ng = {g}\n")
+        break