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I guess the first term should be -1 and not 1, then:

The common difference of {-1, 4, 9, 14, 19, ...} is 5.

Thus the nth term is given by 5n - 6

→ 17th term is 5×17 - 6 = 79.

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Q: What is the 17th arithmetic term of 1-4-9-14-19?
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