- Added solutions by Robert DiCicco.

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diff --git a/challenge-150/robert-dicicco/ruby/ch-2.rb b/challenge-150/robert-dicicco/ruby/ch-2.rb
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+#!ruby.exe
+
+# Author: Robert DiCicco
+# Date: 31-JAN-2022
+# Challenge 150 Square-Free Integer (Ruby)
+
+fsums = []
+LIMIT = 500
+
+def factors(num)
+  arr = []
+  (1..num).each do |f|
+    if num % f == 0
+      arr.push(f)
+    end
+  end
+
+  return arr
+end
+
+def checkFactors(f)
+  f.each do |p|
+    next if p == 1
+     if IsPerfectSquare(p) == true
+       return false
+     else
+       next
+     end
+   end
+
+   return true
+end
+
+def IsPerfectSquare(num)
+  Integer.sqrt(num) ** 2  == num
+end
+
+(1..LIMIT).each do |num|
+  facarr = factors(num)
+  retval = checkFactors(facarr)
+
+  if retval
+    fsums.push(num)
+  end
+end
+
+puts "#{fsums}"