Item 0.3.2.d.
Now we are looking for natural numbers that are equal to taking some natural number, squaring it and adding 1. That is, \(\{1, 2, 5, 10, \ldots\}\text{,}\) the same set as the previous part. So again, the least element is 1.
Now we are looking for natural numbers that are equal to taking some natural number, squaring it and adding 1. That is, \(\{1, 2, 5, 10, \ldots\}\text{,}\) the same set as the previous part. So again, the least element is 1.