2, 9, 25, 82, 335, ?

Solution

Numbers are multiplied by successive natural numbers and then 7 is added

2 $$\times 1 + 7$$ = 9

9 $$\times 2 + 7$$ = 25

25 $$\times 3 + 7$$ = 82

82 $$\times 4 + 7$$ = 335

335 $$\times 5 + 7$$ = 1682

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