Data commit

Task/Loops-Increment-loop-index-within-loop-body/Lua/loops-increment-loop-index-within-loop-body.lua

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+-- Returns boolean indicate whether x is prime
+function isPrime (x)
+  if x < 2 then return false end
+  if x < 4 then return true end
+  if x % 2 == 0 then return false end
+  for d = 3, math.sqrt(x), 2 do
+    if x % d == 0 then return false end
+  end
+  return true
+end
+
+-- Main procedure
+local n, i = 0, 42
+while n < 42 do
+  if isPrime(i) then
+    n = n + 1
+    print("n = " .. n, i)
+    i = 2 * i - 1
+  end
+  i = i + 1
+end