One number, such as 7101316 does not define a sequence.
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The nth term of an arithmetic sequence = a + [(n - 1) X d]
Because that is how it is defined and derived.
7 - 4n where n denotes the nth term and n starting with 0
It is the sequence of first differences. If these are all the same (but not 0), then the original sequence is a linear arithmetic sequence. That is, a sequence whose nth term is of the form t(n) = an + b
Nth number in an arithmetic series equals 'a + nd', where 'a' is the first number, 'n' signifies the Nth number and d is the amount by which each term in the series is incremented. For the 5th term it would be a + 5d