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Jun 25, 2011 at 19:41 history edited Alain Valette CC BY-SA 3.0
Removed confusion between two related questions
Jun 25, 2011 at 13:27 comment added TMM I guess Alain meant to write $3n+1$ there? As indeed, on the negative integers there are multiple known cycles and $\{1,2\}$ is not one of them.
Jun 24, 2011 at 22:04 history answered Alain Valette CC BY-SA 3.0