$${ 15 }^{ 3 } - { 9 }^{ 3 } - { 6 }^{ 3 }$$
$2430$
$$3375-9^{3}-6^{3}$$
$$3375-729-6^{3}$$
$$2646-6^{3}$$
$$2646-216$$
$$2430$$
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$2\times 3^{5}\times 5$
