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It would be more interesting if this kata was about full transcription.
Which complexity is enough to solve this kata?
But where are the solutions for 23, 25-29, 38-40, &c.?
Awaiting Python version :(
Very strange kata.
What for are two costs used?
Yes, the description is really not clear. I guessed the aim only thanks to the test code.
This comment is hidden because it contains spoiler information about the solution
https://en.wikipedia.org/wiki/Elliptic_curve_primality#Example_of_Atkin%E2%80%93Morain_ECPP
If you would like to learn more about elliptic curves per se, I can recommend this article:
https://web.archive.org/web/20210513235048/https://andrea.corbellini.name/2015/05/17/elliptic-curve-cryptography-a-gentle-introduction/
I am interesting whether anyone did this through elliptic curves? I was too lazy for something like that.