There seems to be no logical order to this set of numbers.
* * * * *
Or, you could try 78.
Fit the quartic polynomial
t(n) = (7n4 - 66n3 + 221n2 - 186n + 216)/24 for n = 1, 2, 3, ...
18
108
29, assuming it is an algebraically reclusive sequence.
18-the correct number should be 20.
The series appears to be following a pattern where each number is the result of a mathematical operation on the previous numbers. In this case, the pattern seems to be adding consecutive odd numbers starting from 1. 1 + 8 = 9 9 + 9 = 18 18 + 7 = 25 25 + 2 = 27 27 - 6 = 21 Following this pattern, the next number in the series would be 21 + 1 = 22.
21
24
24, they are going up in 3's, 13, 16, 19 and 18, 21 so next number is 24.
13 18 16 21 19 24 22 27 25 ... . This series consists of adding 5 to the first number and subtracting 2 from the next number, repeating the sequence in that order.
3 The series is obtained by subtracting a number that reduces by 1 at each stage 18 - 5 = 13 13 - 4 = 9 9 - 3 = 6 6 - 2 = 4 4 - 1 = 3
18
The next number in the series 4, 12, 6, 12, 36, 18, 36
24 for each number you add 5 and then subtract 2. 19 plus 5 is 24.
The next number in the series 4-12-6-12-36-18-36.. is 108.
Since the numbers are going down be 5,4,3,2, the next number would be 3. It would be 3 because it would then go down by one.
18
53