Data commit

Task/Semiprime/Crystal/semiprime-1.crystal

@@ -0,0 +1,13 @@
+def semiprime(n)
+  nf = 0
+  (2..n).each do |i|
+    while n % i == 0
+      return false if nf == 2
+      nf += 1
+      n  /= i
+    end
+  end
+  nf == 2
+end
+
+(1675..1681).each { |n| puts "#{n} -> #{semiprime(n)}" }

Task/Semiprime/Crystal/semiprime-2.crystal

@@ -0,0 +1,5 @@
+def semiprime(n)
+  `factor #{n}`.split(' ').size == 3
+end
+n = 0xffffffffffffffff_u64 # 2**64 - 1 = 18446744073709551615
+(n-50..n).each { |n| puts "#{n} -> #{semiprime(n)}" }