What's the Ulam spiral ?
In this repository, I offer two versions of the Ulam spiral. The first is an interactive application written in JavaScript on which you can create your own Ulam spiral according to certain parameters. The second is a version written in Python.
My codes are based on the A063826 sequence:
let
The interactive application is programmed with the p5.js library. This library is ideal because it has a full set of drawing functionality.
To use the library, simply add it to your HTML code:
<!DOCTYPE html>
<html>
<head>
<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.10.2/p5.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.10.2/addons/p5.sound.min.js"></script>
</head>
</html>
Here is an output example with a size 15 Ulam spiral starting at 1:
197 193 191
139 137
199 101 97 181
61 59 131
103 37 31 89 179
149 67 17 13
5 3 29
151 19 2 11 53 127
107 41 7
71 23
109 43 47 83 173
73 79
113
157 163 167
211 223