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7, 26, 63, 124, 215, 342, (...) :

Correct Answer: 511

Explanation:

Numbers are (23 - 1), (33 - 1), (43 - 1) (53 - 1), (63 - 1) (73 - 1) etc.
So, the next number is (83 - 1) = (512 - 1) = 511.


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