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f(n) = n2 + 1

This has an infinite number of input values, starting in negative infinity, and going to positive infinity. However, if what you mean to ask is what are the first three terms if you keep inputting the output you get back into the equation, that all depends on where you start. Let's say you start from 1.

f(1) = 12 + 1 = 2

f(2) = 22 + 1 = 5

f(5) = 52 + 1 = 26

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Q: First three terms of a number sequence n squared plus 1?
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