Complete the Series 1, 3, 26, 649, ___

1, 3, 26, 649, ___.

Asked by: Vinay Bhati on Dec 25, 2020.EDIT

1 Answer

Addya Prasad Tiwari said: (Tue, Feb 2, 2021 12:23:06 PM IST)

1
1 * 2^2 - 1 = 3
3 * 3^2 - 1 = 26
26 * 5^2 - 1 = 649
649 * 7^2 - 1 = 31800.

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