What should come in place of the question mark (?) in the following number series ?
7, 33, 137, 553, ?, 8873
The pattern here followed is :
7 $$\times$$ 4 + 5 = 33
33 $$\times$$ 4 + 5 = 137
137 $$\times$$ 4 + 5 = 553
553 $$\times$$ 4 + 5 = 2217
2217 $$\times$$ 4 + 5 = 8873
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