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 .
Therefore, for an N-bit integer, we only have to run the test N times on average to find a prime.
Since say, A 512-bit integer is already humongous and sufficiently large, we would only need to search 512 times on average even for such sizes, and therefore the procedure scales well.
This 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.
Lecture notes transcribed by a student: github.com/avstjohn/qft
18 1h30 lectures.
Neptune by Ciro Santilli 37 Updated 2025-07-16
Quite cool how it was discoverd by the perturbation of Uranus' orbit.
Arm on tracks by Ciro Santilli 37 Updated 2025-07-16
"Arm on tracks" refers to a variant of the robotic arm robot form factor in which the position of attachment of the robotic arm can also be moved around linearly or with more degrees of freedom.
Snakes and Ladders by Ciro Santilli 37 Updated 2025-07-16
"Game" is a bit of a stretch as there are no player choices at all.
A more precise word would be simulation.
More precise, this "game" is exactly an absorbing Markov chain.
Porn vlog by Ciro Santilli 37 Updated 2025-07-16
This is a porn style defined by Ciro Santilli as:
  • content is designed and owned by the actors
  • full face reveal
  • doing normal vlog things like talking, visiting places, eating, etc., not just fucking
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:
Human mtDNA by Ciro Santilli 37 Updated 2025-07-16
This was the first large part of the genome that was sequenced, in 1981: Cambridge Reference Sequence. Presumably they picked it because it is short and does not undergo crossover.
About 16.6 kbp:
TODO: many places say "exactly" 16,569, it seems that variable number tandem repeat are either rare or don't occur!

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