I remember doing combinatorics puzzles and number theory exercises in platforms like Brilliant when I had a bit of free time. All the while learning something. But the last time I tried Brilliant I did not enjoy it as much and I can’t afford it not anyway.
Does anyone have any recommendations of websites (or webrings), apps or games about or that touch on:
- combinatorics puzzles
- modular arithmetic puzzles
- concepts or exercises of number theory
If you like doing long paper working, a youtube channel called mind your decisions has a vast wealth of problems. Some of them are duplicates with different variables. If you turn on youtube history you can effectiveky mark off how many you have solved.
I think scientific american has short maths and logic puzzles publiahed maybe weekly or daily. https://www.scientificamerican.com/games/math-puzzles/
Also shout out to cryptogram/cipher style games, which i see as reasonably mathematical
https://cyphrgame.com/ https://decipher.wtf/ https://cryptograms.puzzlebaron.com/play.php
I think the puzzle baron one might be dominated by bots because it has solve times of 1 second listed when i do it.