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feat(GreenOpenProblems): 7, positive density part#3661

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mo271 merged 1 commit intogoogle-deepmind:mainfrom
aditya-ramabadran:fix/issue-1546
Apr 4, 2026
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feat(GreenOpenProblems): 7, positive density part#3661
mo271 merged 1 commit intogoogle-deepmind:mainfrom
aditya-ramabadran:fix/issue-1546

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Does Ulam's sequence have positive density? Can one explain the curious Fourier properties of Ulam's sequence?

I've formalized the first part, basically borrowing what I did in #3438. I discuss the second part more in the issue #1546.

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@github-actions github-actions bot added the green-problems Problems from https://people.maths.ox.ac.uk/greenbj/papers/open-problems.pdf label Mar 29, 2026
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Thanks, LGTM!

@mo271 mo271 merged commit db82364 into google-deepmind:main Apr 4, 2026
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green-problems Problems from https://people.maths.ox.ac.uk/greenbj/papers/open-problems.pdf

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