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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
And just for fun, I also implemented the Ulam spiral described in the Numberphile video. Viewable at https://primes.bullinger.dev/?type=ulam. Implementing the square spiral was an interesting challenge. In case anyone is interested, I think I found quite an elegant solution using a generator function.
You might think about adding the ability to compare to random numbers. If you want them to be the same density as the primes, you can use the prime number theorem (that the chance of x being a prime is approx 1/ln(x)). I did the same a few years ago in a C++ app (https://github.com/rjrosati/prime-spirals), but it's really nice having it accessible on the web.
Not to mention here's a spec issue where they considered forbidding other units in a future spec version to eliminate the browser mismatch.
Related posts
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The Sieve of Atkin
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Spiral – High-Performance PHP Framework
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Primesieve: Fast Prime Number Generator
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I have to brag to you: I gained computing resources on the third most powerful supercomputer in the world. The computing resources will be used for the computational verification of the Collatz problem.
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Procedural galaxy generation (a bit stuck...)