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after -9 it is -15 then -21, -27 and the ninth is -36
Double it minus the previous number.
The simplest, out of infinitely many possible answers, is the linear polynomial,U(n) = 4n - 1 for n = 1, 2, 3, ...
If you mean: 15 11 7 3 then the nth term is 19-4n
Assuming this is a linear or arithmetic sequence, the nth term is Un = 31 - 8n. But, there are infinitely many polynomials of order 5 or higher, and many other functions that will fit the above 5 numbers.
The nth term in this sequence is 4n + 3.
It is: nth term = 29-7n
The nth term is 4n-1 and so the next term will be 19
The nth term is -7n+29 and so the next term will be -6
3n
The nth term is 18 -3n and so the next term will be 3
The nth term for that arithmetic progression is 4n-1. Therefore the next term (the fifth) in the sequence would be (4x5)-1 = 19.
after -9 it is -15 then -21, -27 and the ninth is -36
t(n) = 3n2 + n + 1
The nth term is: 5n
Double it minus the previous number.
A single number, such as 1521273339 does not define a sequence. There is no nth term for a signle number.