Two years ago i shared this website where you try and determine when a shade is either blue or green.
Posting it again because lemmy has grown quite a bit since then, maybe we have more people that havent tried it!
I got 175, but oddly when I look at the final result it's off. If I had been asked to pick the dividing line when I can see all hues at once it would have been more to the right. My strategy was if I could see any hint of green, so by themselves some of the ones near 175 looked blue, but then pick up the green cast when they're near another green.
I tested again, slower, and still got 176.