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The series appears to increase as follows: 1 (+3), 4 (+5), 9 (+7), 16,, etc. If so, the next number in the series would be 25 (16 + 9).

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While mathematically equivalent, a simpler description is:

12, 22, 32, 42, 52 ...

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13y ago
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Q: What number should come next in this series 1 4 9 16?
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