What should come in place of the question mark (?) in the following number series?
Cubes of natural numbers are added in the series
17 + $$1^3$$ = 18
18 + $$2^3$$ = 26
26 + $$3^3$$ = 53
53 + $$4^3$$ = 117
117 + $$5^3$$ = 242
242 + $$6^3$$ = 458
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