4, 7, 13, 25, 49, 97, 193, ?

4, 7, 13, 25, 49, 97, 193, ?

Solution is:

4+3=7

7+3*2=13

13+3*4=25

25+3*8=49

49+3*16=97

97+3*32=193

193+3*64=385    

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