Make GPU sieve results authoritative

PerfectNumbers.Core/Gpu/Kernels/PrimeTesterKernels.cs

@@ -15,34 +15,44 @@ internal static class PrimeTesterKernels
         ArrayView<uint> smallPrimesLastSeven,
         ArrayView<uint> smallPrimesLastThree,
         ArrayView<uint> smallPrimesLastNine,
+        ArrayView<ulong> smallPrimesPow2,
+        ArrayView<ulong> smallPrimesPow2LastOne,
+        ArrayView<ulong> smallPrimesPow2LastSeven,
+        ArrayView<ulong> smallPrimesPow2LastThree,
+        ArrayView<ulong> smallPrimesPow2LastNine,
         ArrayView<byte> results)
     {
         ulong n = numbers[index];
         byte result = 1;
 
         ArrayView<uint> primes = smallPrimes;
+        ArrayView<ulong> primeSquares = smallPrimesPow2;
         ulong lastDigit = n % 10UL;
         switch (lastDigit)
         {
             case 1UL:
                 primes = smallPrimesLastOne;
+                primeSquares = smallPrimesPow2LastOne;
                 break;
             case 3UL:
                 primes = smallPrimesLastThree;
+                primeSquares = smallPrimesPow2LastThree;
                 break;
             case 7UL:
                 primes = smallPrimesLastSeven;
+                primeSquares = smallPrimesPow2LastSeven;
                 break;
             case 9UL:
                 primes = smallPrimesLastNine;
+                primeSquares = smallPrimesPow2LastNine;
                 break;
         }
 
-        int length = (int)primes.Length;
+        int length = XMath.Min((int)primes.Length, (int)primeSquares.Length);
         for (int i = 0; i < length; i++)
         {
             ulong prime = primes[i];
-            ulong primeSquare = prime * prime;
+            ulong primeSquare = primeSquares[i];
             if (primeSquare > n)
             {
                 break;