3blue1brown 69

0 views

Skip to first unread message

Janne Desir

unread,

Aug 3, 2024, 11:25:39 AM8/3/24

to downparumo

In the level you can't use the number 9 or a decimal point (on fire) and there are unknown unary and binary operators. It recommends you watch the 3blue1brown video "Pi hiding in prime regularities" which mentions lattice points around a circle of radius sqrt of x, so I got that A004018 is basically the unary function.

I can't really find a formula for this, so I've given myself to using what little programming skills I have to build it in python, but none of that matters if I can't figure out the binary operator (you need to use both operators to calculate 40). Sorry for the long explanation, but my question is basically, what is the binary function doing and how would you calculate 40 without using a decimal point or a 9 and using both A004018 and the binary function.

EDITS: In this particular level, There are only two functions, binary and unary. The distinction between the regular unary function and the OEIS one seems a bit superficial, in this one it's the diamond symbol, not sure why they chose to do that. Yes, I understand it would be difficult without actually playing the game and experimenting. I'm going to finish my python script and update the post if I can find a solution that equals 40 using the unary lattice points function thing. If I find that, it'll just be a matter of getting the binary function to return that answer, in the form u(b(x,y))=40. I've added some more data below: