Number pattern problem: 2, 7, 26, 101, 400, what is the next number?

Answer 1

if 2 7 26 101 400 y are the sequence numbers

The differences are

5 19 75 299 1195

And

4x5 -1 = 19

4x19-1 = 75

4x75-1 = 299

4x299-1 = 1195

Then y-400 = 1195 or y = next number in the sequence = 1595