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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The 90th term of the arithmetic sequence is 461
It is a + 8d where a is the first term and d is the common difference.
The mean
10,341
The constant increment.