Practical numbers: Difference between revisions

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(→‎{{Header|Python}}: Remove empty set from powerset calculator.)
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STRETCH GOAL: 666 is Practical.</pre>
STRETCH GOAL: 666 is Practical.</pre>


; Alternate version:
This version might has an optimisation that might prove ``much`` faster in some cases but slower than the above in others.


===Or, as a composition of pure functions===
===Or, as a composition of pure functions===