28
The next composite number after 20 is 21.
the next number is 21 because it is adding the last number stated.
The next number will be 13+21 = 34
The next number in the sequence 3-15-6-30-21 is -207.
If you mean: 1 1 2 3 5 8 13 21 then the next number is 13+21 = 34
The next number is -21
To find the next number in the sequence 5, 15, 12, 24, 21, 21, 18, we can analyze the pattern. The differences between the numbers are: 10, -3, 12, -3, 0, -3. Following this pattern, the next difference would likely be 12, resulting in a next number of 18 + 12 = 30. Thus, the next number in the sequence is 30.
31
a
111221
63
26