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Numbers of the universe (V1)
https://en.wikipedia.org/wiki/Number
https://en.wikipedia.org/wiki/Portal:Mathematics
https://en.wikipedia.org/wiki/Number_theory
https://en.wikipedia.org/wiki/List_of_numbers
links if you want to learn more!
My personal favourites.
Level 2: Beginner numbers
Level 3: Intermediate numbers
Level 5: confusing numbers
level 6: numbers with weird patterns and "magical" properties
level 7: LITERALLY JUST GIBBERISH.