With 16 entries, I've a feeling it's one of the larger number of entries with code in all four languages: C, C++, C# and Google Go. Congratulations to Swede Tapani Utriainen whose entry was easily the fastest. It included inline assembly language and I've never made up my mind whether to exclude that so I could hardly disqualify him. Plus there's an argument that says why not allow it as it was valid C code according to GCC.
Thank you to everyone who entered. Interestingly the fastest entry was 251,656 faster than the slowest! The source files are now up.