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Calculate results for up to to the power of concats. Since StringBuilder is slow, limit it to power of Run!

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On Chrome Version 84.0.4147.89 (Official Build) (64-bit) I was able to do 2^26 before the browser ran out of memory.

I even tried increasing the js heap limit and that did not help: https://bugs.chromium.org/p/v8/issues/detail?id=847 recommends opening chrome with -args --js-flags="--max_old_space_size=8192" after experimenting with it a bit, the command will look like: "C:\Program Files (x86)\Google\Chrome\Application\chrome.exe" -args --js-flags="--max_old_space_size=8192" from a command prompt. You can confirm by opening developer tools console and running console.memory and your jsHeapSizeLimit should be larger than without the flag.

On Firefox 78.0.2 (64-bit) I was also able to to do 2^27 before the browser ran out of memory.