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Japt, 17 bytes Needs some more work. É?[U]cßÂUp½+Uu:1ì Try it If there's a proof that the length of the sequence for any given n never exceeds n**3 then ... Japt, 14 bytes NcU³Æ=Âp½+UuÃâ ...
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#1: Initial revision
# [Japt](https://github.com/ETHproductions/japt), 17 [bytes](https://en.wikipedia.org/wiki/ISO/IEC_8859-1) Needs some more work. É?[U]cßÂUp½+Uu:1ì [Try it](https://petershaggynoble.github.io/Japt-Interpreter/?v=1.4.6&code=yT9bVV1j38JVcL0rVXU6Mew&input=Mw) If there's a proof that the length of the sequence for any given `n` never exceeds `n**3` then ... # [Japt](https://github.com/ETHproductions/japt), 14 [bytes](https://en.wikipedia.org/wiki/ISO/IEC_8859-1) NcU³Æ=Âp½+UuÃâ [Try it](https://petershaggynoble.github.io/Japt-Interpreter/?v=1.4.6&code=TmNVs8Y9wnC9K1V1w%2bI&input=Mw)