The Google Story suggests that this practice existed in academia, where it was brought from. But I can't find external references to it easily:
At Google, the preference is for working in small teams of three, with individual employees expected to allot 20 percent of their time to exploring whatever ideas interest them most. The notion of "20 percent time" is borrowed from the academic world, where professors are given one day a week to pursue private interests.
Answers suggest hat you basically pick a random large odd number, and add 2 to it until your selected primality test passes.
The prime number theorem tells us that the probability that a number between 1 and is a prime number is .
Bibliography:
Quantum field theory lecture by Tobias Osborne (2017) by 
Ciro Santilli 35 Updated 2025-04-18 +Created 1970-01-01
Ciro Santilli 35 Updated 2025-04-18 +Created 1970-01-01This is a bit "formal hocus pocus first, action later". But withing that category, it is just barely basic enough that 2021 Ciro can understand something.
By: Tobias J. Osborne.
Lecture notes transcribed by a student: github.com/avstjohn/qft
18 1h30 lectures.
Followup course: Advanced quantum field theory lecture by Tobias Osborne (2017).
This is a porn style defined by Ciro Santilli as:
Ciro believes that this is an interesting type of pornography, as it feels more natural and humane than all the horrible trash that comes out of horrendous professional mainstream porn industry.
Yes, it could go down the YouTube/Instagram alley, and lead the vloggers to do things they wouldn't normally do because of the audience. But who is to say that Ciro Santilli doesn't do the same on Stack Overflow to some extent?
That type of porn requires some big courage to make. Or balls if you will. Kudos to those creators, as it is so taboo it could greatly impact their future job prospects.
The travel sex vlog appears to be the most popular way to do it. Presuamably the reason being that you would not be able to interact with people in a normal job, so to keep things interesting you need to go to some random places.
Examples:
- lunaokko.com/social-media/ Luna Okko. French sex vlogger, basically a super normal travel vlog with sex scenes with her boyfriend added in, see e.g. the series "Luna's Journey".Perhaps the travel porn vlog is the simplest way to do it. A sex vlog is much like a cooking flog in some way, except it is hard to get new ingredients, so changing the scenery is the easiest way to get some diversity.Some day some nymphomaniac should actually make a sex vlog fucking a different man each time, that would be amazing, even from a scientific point of view, so we can see how different men fuck, a bit like an open version of en.wikipedia.org/wiki/Masters_of_Sex.2022 interview: www.youtube.com/watch?v=qGcWrpXXtuQ
- twitter.com/JamesWithLola also a travel sex vlog, also French. Hum.
There are unlisted articles, also show them or only show them.