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Q: What is the nth term of 15 21 27 33 39?

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after -9 it is -15 then -21, -27 and the ninth is -36

2n +29

I can tell you that it is increasing 9, 15, 21, 27. i.e. adding on 6 to the gap each time so if you mean the next term by nth term, then it will be adding on 33, which will leave you at 113

A single number, such as 1521273339 does not define a sequence. There is no nth term for a signle number.

It is: 27-2n

The nth term is: n^2 +2 and so the next number will be 38

There are infinitely many possible answers. But the simplest is Un = 33 - 3n for n = 1, 2, 3, ...

The nth term of the sequence is (n + 1)2 + 2.

Willies

The pattern is: +11, +15, +19, +23, +27 (4n+7) So, the next number would be: (4*6 + 7) = 24 + 7 = +31 Therefore, the answer is: 105 + 31 = 136

n3

5n+2

3 is a multiple of 15, 21, and 27.

each time the number increases by 8 and the original number was 3.This means that nth term = 3+(n-1)8ie. the fourth term 27 would be 3 + (4-1)x8 = 3+24 = 27

There is no pattern

9 3 1

The pattern for the nth term is n3. Therefore, the fourth term in the sequence is equal to 43 = 64.

The least common multiple of 19 , 15 , 27 , 21 = 17,955

3^n These are powers of 3

The LCM of 15, 21 and 27 is 945.

The Greatest Common Factor of 15, 21, 27: 3

15 = 3 x 521 = 3 x 727 = 3 x 3 x 3hcf of 15 and 21 is 3lcm of 15 and 21 = 15 x 21 / 3 = 105hcf of 105 and 27 = 3lcm of 105 and 27 = 105 x 27 / 3 = 945

nth term is 8 - n. an = 8 - n, so the sequence is {7, 6, 5, 4, 3, 2,...} (this is a decreasing sequence since the successor term is smaller than the nth term). So, the sum of first six terms of the sequence is 27.

The Least Common Multiple (LCM) of (15, 21 and 27) is 945.

55 + 34 + 31 + 27 + 21 + 21 + 20 + 17 + 15 + 15 = 256

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