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Filters out all factors, and selects the ones in the middle.
f(X)->Y=lists:lastmax([I||I<-lists:seq(1,ceil(math:sqrt(X))),X rem I==0]I==0,I*I=<X]),[Y,X/Y].
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f(X)->Y=lists:last([I||I<-lists:seq(1,ceil(math:sqrt(X))),X rem I==0]),[Y,X/Y].
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f(X)->Y=lists:max([I||I<-lists:seq(1,X),X rem I==0,I*I=<X]),[Y,X/Y].
