1 files changed, 35 insertions, 0 deletions
diff --git a/challenge-144/roger-bell-west/python/ch-1.py b/challenge-144/roger-bell-west/python/ch-1.py
new file mode 100755
index 0000000000..34a6e6d424
--- /dev/null
+++ b/challenge-144/roger-bell-west/python/ch-1.py
@@ -0,0 +1,35 @@
+#! /usr/bin/python3
+
+import unittest
+
+def semiprime(mx):
+  mxx=int(mx/2)
+  primesh=set(range(2,mxx+1))
+  p=2
+  while p*p <= mxx:
+    if p in primesh:
+      for i in range(p*p,mx+1,p):
+        primesh.discard(i)
+    if p==2:
+      p -= 1
+    p += 2
+  primes=list(primesh)
+  primes.sort()
+  semiprimesh=set()
+  for i in range(len(primes)):
+    for j in range(i,len(primes)):
+      t=primes[i]*primes[j]
+      if t <= mx:
+        semiprimesh.add(t)
+      else:
+        break
+  semiprimes=list(semiprimesh)
+  semiprimes.sort()
+  return semiprimes
+
+class TestSemiprime(unittest.TestCase):
+
+        def test_ex1(self):
+          self.assertEqual(semiprime(100),[4, 6, 9, 10, 14, 15, 21, 22, 25, 26, 33, 34, 35, 38, 39, 46, 49, 51, 55, 57, 58, 62, 65, 69, 74, 77, 82, 85, 86, 87, 91, 93, 94, 95],'example 1')
+
+unittest.main()