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Code Golf

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    \$\begingroup\$ Talk about right tool for the job.. \$\endgroup\$ Commented May 5, 2017 at 7:02
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    \$\begingroup\$ "Don't upvote trivial solutions that only uses a simple builtin." Well, in this case: Knowing that there's a language "Fractran" that has a single builtin that solves this specific task is by itself impressive. \$\endgroup\$ Commented May 5, 2017 at 8:51
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    \$\begingroup\$ @Pandya: Some Fractran implementations use prime factorization internally (as an optimization), but they don't have to; the language operates on factors, not prime factors. (It just happens that 2 and 3 are prime.) \$\endgroup\$ Commented May 5, 2017 at 12:23
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    \$\begingroup\$ Related SO code golf (pre-PPCG): Write a Fractran interpreter. \$\endgroup\$ Commented May 8, 2017 at 5:29
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    \$\begingroup\$ @AnderBiguri It looks like it came out of his studies of the Collatz conjecture; he proved that a generalization of Collatz is equivalent to Fractran and that Fractran is Turing-complete, therefore generalized Collatz is undecidable. \$\endgroup\$ Commented May 8, 2017 at 18:00