Talk:Rare numbers: Difference between revisions

== Tweaks, C++ ==

Wringing out some more performance here, just over 5 minutes for 19 digits by themselves, and just over 6 minutes for digits 2 thru 19. See the code comments for details on what was tweaked. Curiously, I found that the g++ version executes faster than the clang++ version. Compiler arguments used: <code>g++ rare.cpp -o rare.exe -std=c++17 -O3</code><br/>Curious to see if it can go faster on a different platform - But the original executed faster on g++ than clang++ for me on my platform too. Perhaps I don't have clang++ set up the same as others?

 

/*

printf("%4s %19s %11s %10s %5s %11s %9s\n", "nth", "forward", "rt.sum", "rt.diff", "digs", "block.et", "total.et");

for (int nd = 2; nd <= max; nd++) Rare(int(nd));

{{out}}

Results on the core i7-7700 @ 3.6Ghz.