They don't have an actual online judge system, all problems simply have an integer or floating point solution and they just check that you've found the value.
The only metric that matters is who solved the problem first after publication, e.g.: projecteuler.net/fastest=454. The "language" in which problems were solved is just whatever the user put in their profile, they can't actually confirm that.
Project Euler problems typically involve finding or proving and then using a lemma that makes computation of the solution feasible without brute force. As such, they live in the intersection of mathematics and computer science.
List of just the solution values:
Code solutions by individuals:Basically no one ever had the patience to solve them all. What we need is a collaborative solution.
Problems are under CC BY-NC-SA: projecteuler.net/copyright
How problems are chosen:
projecteuler.net says it started as a subsection in mathschallenge.net, and in 2006 moved to its own domain. WhoisXMLAPI WHOIS history says it was registered by domainmonster.com but details are anonymous. TODO: sample problem on mathschallenge.net on Wayback Machine? Likely wouldn't reveal much anyways though as there is no attribution to problem authors on that site.
www.hackerrank.com/contests/projecteuler/challenges holds challenges with an actual judge and sometimes multiple test cases so just printing the final solution number is not enough.
Programming problem collection website by 
Ciro Santilli 37 Updated 2025-05-26 +Created 2025-03-20
Ciro Santilli 37 Updated 2025-05-26 +Created 2025-03-20They do some really fun hardcore mathy stuff over there!
Ciro Santilli interned at Inria Centre at Université Côte d'Azur in the early 2010's. It was a disaster, largely his own fault, but also due to our broken educational system. But they do have awesome things as well.
Applied mathematics research institute by Ciro Santilli 37 Updated 2025-05-26 +Created 2025-03-20
Ciro Santilli 37 Updated 2025-05-26 +Created 2025-03-20This is a small fork of activatedgeek/LeNet-5 by Ciro Santilli adding better integration and automation for:
Install on Ubuntu 24.10:
sudo apt install protobuf-compiler
cd lenet
virtualenv -p python3 .venv
. .venv/bin/activate
pip install -r requirements-python-3-12.txtDownload and extract MNIST train, test accuracy, and generate the ONNX Extract MNIST images as PNG:Infer some individual images using the ONNX:Draw on a GUI and see live inference using the ONNX:TODO: the following are missing for this to work:
lenet.onnx:./train.py./extract_pngs.py./infer.py data/MNIST/png/test/0/*.png./draw.py- start a background task. This we know how to do: stackoverflow.com/questions/1198262/tkinter-locks-python-when-an-icon-is-loaded-and-tk-mainloop-is-in-a-thread/79502287#79502287
- get bytes from the canvas: all methods are ugly: stackoverflow.com/questions/9886274/how-can-i-convert-canvas-content-to-an-image
raised $1b at $5b valuation on september 2024, then $2b at $30b on march 2025. lol!
Kinesin protein walking on microtubule by XVIVO
. Source. Clip from Video "The Inner Life of the Cell by XVIVO Scientific Animation (2011)" with captions added in.Kinesin Motor Protein 3D Animation by Art of the cell
. Source. Responsible for muscle contraction.
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