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Task/Semiprime/Ring/semiprime.ring

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+prime = 1679
+decomp(prime)
+
+func decomp nr
+x = ""
+sum = 0
+for i = 1 to nr
+    if isPrime(i) and nr % i = 0
+       sum = sum + 1
+       x = x + string(i) + " * " ok
+    if i = nr and sum = 2
+       x2 = substr(x,1,(len(x)-2))
+       see string(nr) + " = " + x2 + "is semiprime" + nl
+    but i = nr and sum != 2 see string(nr) + " is not semiprime" + nl ok
+next
+
+func isPrime n
+     if n < 2 return false ok
+     if n < 4 return true ok
+     if n % 2 = 0 return false ok
+     for d = 3 to sqrt(n) step 2
+         if n % d = 0 return false ok
+     next	
+     return true