What is the next number after 2, 5, 9, 19, 37?

What is the next number after 2, 5, 9, 19, 37?

75

77

79

99

Solution

2,

2*2+1=5,

5*2-1=9,

9*2+1=19,

19*2-1=37,

37*2+1=75.

So the answer would be 75

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