Collatz conjecture
Does the 3n + 1 process always reach 1, whatever number it starts from?
Summary
Halve an even number, send an odd n to 3n + 1, and repeat: the question is whether every positive integer ends at 1.
Source
Open, as listed by Wikipedia · Unsolved problems in mathematics. Checked 29 Sep 2026.
The status is the source’s. Papex does not decide whether a problem is solved.
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