What Comes Next?

12 + 23 x 2^0 = 35

35 + 23 x 2^1 = 81

81 + 23 x 2^2 = 173

173 + 23 x 2^3 = 357

so the next one are:

357 + 23 x 2^4 = 725

725 + 23 x 2^5 = 1461

...

or

12 x 2 + 11 = 35

35 x 2 + 11 = 81

81 x 2 + 11 = 173

173 x 2 + 11 = 357

so the next one are:

357 x 2 + 11 = 725

725 x 2 + 11 = 1461

...

The differences between terms are doubling:

$23,46,92,184$

so the next term will be $357+2\cdot 184 = 725.$

We can also notice that the series follows the following pattern

12*2+11=35

35*2+11=81

81*2+11=173

173*2+11=357

and the next number will be

357*2+11=725

35 x 3 - (12 x 2) = 81

81 x 3 - (35 x 2) = 173

173 x 3 - (81 x 2) = 357

357 x 3 - (173 x 2) = 725

That was how I found the number :)

12,12+23=35, 35+46=81, 81+92=173, 173+184=357, 357+368=725