Answers

2016-06-22T22:25:50+08:00
For 5,9,13,17... they are just adding 4 example 5+4=9, 9+4=13, simple as that but the 8,14,26,50... im not sure
but for 2,4,16,256.... they are only multiplying like 2*2= 4, 4*4=16
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