Cool project if you love math (or not) !
The begining : how to write in spiral
The real project : Ulam spiral
Idea from:Coding Train Challenge 167: Ulam Spiral of Prime Numbers
bh
May 2, 2025, 12:09am
2
Interesting. Why does this have a name? Is it mathematically significant? Like, say, are we supposed to take note of the dense ray starting at 13 and going leftward?
From mathematician Stanisław Ulam
The Ulam spiral or prime spiral is a graphical depiction of the set of prime numbers, devised by mathematician Stanisław Ulam in 1963 and popularized in Martin Gardner's Mathematical Games column in Scientific American a short time later. It is constructed by writing the positive integers in a square spiral and specially marking the prime numbers.
Ulam and Gardner emphasized the striking appearance in the spiral of prominent diagonal, horizontal, and vertical lines containing large numbers of pr...
You see this spiral path: it start at 1 in the middle:
get rid of the non-prime numbers !
No, I get it! It's very cool that there are reasons for the visible rays.
