In the following questions pick the odd thing out.
Each of the questions follows a definite pattern, observe the same and fill in the blanks with suitable ones.
9, 28, 126, 344, _________
$$\frac{8}{3}, \frac{25}{12}, \frac{5}{9}$$, ______, $$\frac{32}{21}, \frac{81}{56}$$
100, 110, 1000, 1001, _________
101, 103, ________, 109, 113, 127, 131
225, 16, 169, 36, 121, 64, 81, _________