104-2 does not define a series.
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The 90th term of the arithmetic sequence is 461
an arithmetic series equation is a*r^(n-1) where a is the starting value, r is the number you are continuously adding, and n is the term you are looking to find
The series appears to be an arithmetic series in which the n'th term is 1.5 + (n - 1)2.5. If so, the next two terms are 11.5 and 14.
It is a + 8d where a is the first term and d is the common difference.