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    \$\begingroup\$ I think you need to add a call to print(). Also, I couldn't get the code to run on TIO as is, I assume it works on some other version of the language not available there? This runs fine on TIO: print(maximum(collect(values(factor(parse(BigInt,readline())))))) \$\endgroup\$ Commented Oct 26, 2017 at 2:28
  • \$\begingroup\$ This works on the interpreter (on my computer, at least). It also causes a warning because initializing a BigInt like that has been deprecated. Nonetheless, if you copy and paste the code as-is into a Julia interpreter, it should work. (if a print is required because it has to explicitly be printed, ill put that in) \$\endgroup\$ Commented Oct 26, 2017 at 2:36
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    \$\begingroup\$ The print() is needed because the answer needs to be a full program (that displays the output) or a function (that returns the output). Otherwise your solution is fine. It seems that you can save some bytes (and avoid the print) this way: f(x)=maximum(collect(values(factor(x)))) \$\endgroup\$ Commented Oct 26, 2017 at 2:46
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    \$\begingroup\$ You're welcome! Here's a meta post on what is the allowed format for a solution. \$\endgroup\$ Commented Oct 26, 2017 at 2:58