Pythagorean triples
n,(n^2-1)/2,(n^2+1)/2
3,4,5
5,12,13
7,24,25
9,40,41
11,60,61
13,84,85
15,112,113
17,144,145
19,180,181
n,n^2/4-1,n^2/4+1
8,15,17
12,35,37
16,63,65
20,99,101
other
20,21,29
Back to Number Sense