GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it

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% 3k+1 bibliography
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@book {Wi98,
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    author = {Wirsching, G�nther J.},
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     title = {The dynamical system generated by the $3n+1$ function},
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 publisher = {Springer-Verlag},
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    series = {Lecture Notes in Mathematics},
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    volume = {1681},
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   address = {Berlin},
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      year = {1998},
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     pages = {viii+158},
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      isbn = {3-540-63970-5}
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}
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