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Challenges related to elementary arithmetic.

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Sum of five cubes

PowerShell Core, 52 bytes $o,(1-($k=($o*$o-1)*$o/6)),(-$k-1),$k,$k|%{$_*$_*$_} Try it online! Uses the equation o=o^3 + (1-k)^3 + (-k-1)^3 + k^3 + k^3, where k=o^3 - o; this is a minor refactori …
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