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Which number will come next in the following series?
1, 2, 5, ...., 677
Pattern being followed here is $$n^2 + 1$$
Like $$1, 1^2 + 1, 2^2 + 1, 5^2 + 1.......
Hence 1, 2, 5, 26.......
(Same explanation more detailed required)
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