Number of people needed for a good gene pool

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Hi /sci/ I am curious as to how many people you would need for a successful gene pool. The reason I ask is because we live in an ever-changing world full of chaos. And I want to know how many people you would need to have your people survive in case of a disaster. (Black Death, Nuclear Annihilation, Huge Space Rock, etc.)
I have been doing some research into the matter and found that small numbers of people (in the dozens) can successfully survive for thousands of years.

https://slappedham.com/10-most-isolated-and-dangerous-tribes-in-the-world/2/

There are some tribes that have survived tens of thousands of years with as little as 20-30 people.
What number of people would you recommend /sci/?

pic unrelated.