Which number would come next in the following sequence?

4, 9, 26, 105, 524, ?

4, 9, 26, 105, 524, ?

4 × 2 + 1 = 8 + 1 = 9
9 × 3 - 1 = 27 - 1=  26
26 × 4 + 1 = 104 + 1 = 105
105 × 5 - 1 = 525 - 1 = 524

The same pattern follows continuously;

524 × 6 + 1 = 3144 + 1 = 3145

So, 3145 is next term.

Thus, the correct answer is (b).