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The answer depends on the function used to generate the sequence.

If the function is

Un = (n3 - 3n2 + 8n - 3)/3 for n = 1, 2, 3, ... from which U5 = 29

or

Un = 2n - 1 which would imply the next number is 31.

There are other possible answers.

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Q: What is the next number in sequence 1 3 7 15?
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