数値実験
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1^3+1^3+1^3=3
1^3+1^3+2^3=10
1^3+2^3+2^3=17
2^3+2^3+2^3=24
1^3+1^3+3^3=29
1^3+2^3+3^3=36
2^3+2^3+3^3=43
1^3+3^3+3^3=55
3^3+3^3+3^3=81