Nth term of 3,11,25,45

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asked Dec 24, 2018 115k views

1 Answer

JustinB · Answer 1 · 2018-12-28T18:00:32+0000

3n^2 - n - 2. So nth term of 3,11,25,45, ... is 3 + (3n^2 - n - 2), or simply 3n^2 - n + 1. Check: put say, n=5 into it and get 75 - 5 + 1 = 71 which checks with the 5th term of 3,11,25,45,71,103, ...

Nth term of 3,11,25,45

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