Thanks for the query.

If we take a number as x then it's continuing like 2x +1 when the number goes to an even place and 2x -1 when the number goes an odd place.

So, when we put x = 6 it continues like 2*6 + 1 = 13

Then it goes on like 2*13 - 1 = 25.

Then 2*25 + 1 = 51

Then 2*51 - 1 = 101

Then 2*101 +1 = 203

Then 2*203 - 1 = 405

**So, the answer is 203 and 405.**