general Maths Puzzle

Fill the missing entries in the below series

2, 5, 12, 65, 729,??

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general Other Question

481 = the average of 148, 184, 418, 481, 814 and 841.

What are all the other such 3 digit numbers? A clock gains 18 seconds per day and another loses 39 seconds per day. After what length of time will the first clock 12 hrs ahead of the second?