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20, 21, 33, 68, 172.5, 520.5, ?

What will come next in this number sequence problem?

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1 Answer 1

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The next number in the sequence is

1825.25

Reasoning

(20 x 1.0) + 1.0 = 21
(21 x 1.5) + 1.5 = 33
(33 x 2.0) + 2.0 = 68
(68 x 2.5) + 2.5 = 172.5
(172.5 x 3.0) + 3.0 = 520.5
(520.5 x 3.5) + 3.5 = 1825.25

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