Question

Identify next number in the sequence 15, 29, 56, 108, 208, ?

Answer 1

Based on my calculations what I got is, 

First there is a number 15 then,

                                     15 * 2 - [1] = 29

                                     29 * 2 - [2] = 56

                                     56 * 2 - [4] =108

                                     108*2 - [8] = 208      

Here the numbers which kept are like increasing themselves in each sequence

That is in the first one it was 1 next one 1+1=2 next one 2+2=4 etc.

So the next one will be 208*2 -[16] = 400

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