Find the odd one
2, 5, 10, 26, 37, 50, 64

Explanation

The pattern is based on numbers of the form n^2+1:

1^2+1=2, 2^2+1=5, 3^2+1=10, 5^2+1=26, 6^2+1=37, 7^2+1=50.

For n=8, the corresponding number should be 8^2+1=65, not 64. Therefore 64 is the odd one.