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What is the logic behind number sequence 4 - 5 - 9 - 18 - 34?

Updated: 9/23/2023

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11y ago

There are many possible answers. One possibility is

Un = (2n3 - 3n2 + n + 24)/6

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11y ago

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Q: What is the logic behind number sequence 4 - 5 - 9 - 18 - 34?
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