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I made a small mistake near the end of this video. Firoozbakht's upper bound (the green curve) is the tightest known one, a bit tighter than Cramer's, shown in blue.
![กี่หมื่นฟ้า | Your Sky Series EP.1 [2/4]](http://i.ytimg.com/vi/qJbQs_nhjD4/mqdefault.jpg)
![กี่หมื่นฟ้า | Your Sky Series EP.1 [1/4]](http://i.ytimg.com/vi/vLGjxFL6U_I/mqdefault.jpg)
I made a small mistake near the end of this video. Firoozbakht's upper bound (the green curve) is the tightest known one, a bit tighter than Cramer's, shown in blue.