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diff --git a/challenge-168/eric-cheung/python/ch-2.py b/challenge-168/eric-cheung/python/ch-2.py
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+
+## Remarks
+## https://en.wikipedia.org/wiki/Home_prime
+
+import math
+
+def IsPrime(nInput):
+
+    for nDiv in range(2, int(math.sqrt(nInput)) + 1):
+        if nInput % nDiv == 0:
+            return False
+
+    return True
+
+
+def PrimeFact(nOrigInput):
+
+    nInput = nOrigInput
+    arrPrimeFact = []
+
+    for nDiv in range(2, nOrigInput):
+
+        while nInput % nDiv == 0 and nInput > 0:
+
+            nInput = nInput / nDiv
+            arrPrimeFact.append(nDiv)
+
+        if nInput == 0:
+            break
+
+    return arrPrimeFact
+
+
+def ConcatArray(arrInput):
+
+    strResult = ""
+
+    for arrElem in arrInput:
+        strResult = strResult + str(arrElem)
+
+    return int(strResult)
+
+
+## print (PrimeFact(511))
+## print (ConcatArray(PrimeFact(511)))
+## print (ConcatArray(PrimeFact(8)))
+
+
+nOrigInputNum = 10
+
+nInputNum = nOrigInputNum
+
+while not IsPrime(nInputNum):
+    nInputNum = ConcatArray(PrimeFact(nInputNum))
+
+print ("HP(" + str(nOrigInputNum) + ") = " + str(nInputNum))
+