1 + √2
1
1 – 2 = –1
1 – √2
2
3 + 2√2
3
9 – 8 = 1
3 – 2√2
7 + 5√2
7
5
49 – 50 = –1
7 – 5√2
4
17 + 12√2
17
12
289 – 288 = 1
17 – 12√2
41 + 29√2