{tag=PROMYS Europe 2024}

Visible at: https://www.maths.ox.ac.uk/system/files/attachments/PROMYSEurope_2024_Application-12.pdf

Archive: https://web.archive.org/web/20240224155507/https://www.maths.ox.ac.uk/system/files/attachments/PROMYSEurope_2024_Application-12.pdf


PROMYS Europe 2024 application problem set

* <Greatest common divisor>{full}.
* <Farey sequence>{full}.
  * <Number of elements in a Farey sequence>{full}
  * <Farey sunburst>, e.g. $F_5$:
    \Image[https://upload.wikimedia.org/wikipedia/en/d/de/Sunburst_8.png]


{file}
{tag=GMP example}

Also posted at:
* https://wiki.bbchallenge.org/wiki/Antihydra
* https://cstheory.stackexchange.com/questions/20978/what-is-the-smallest-turing-machine-where-it-is-unknown-if-it-halts-or-not/53326#53326
* https://cs.stackexchange.com/questions/59344/what-are-very-short-programs-with-unknown-halting-status/162108#162108


gmp/antihydra.c

@cirosantilli/_file/gmp/gmp/antihydra.c

{tag=GNU Multiple Precision Arithmetic Library}


Antihydra GMP implementation

https://www.reddit.com/r/math/comments/17y9zj3/how_do_i_tackle_problems_from_the_promysross/


Ciro Santilli @cirosantilli 34