A single number, such as 12848384 does not make a series.
it is 31818 - 8 = 1010 - 4 = 66 - 2 = 44 - 1 = 3
A single number, such as 364758 does not describe a sequence, nor a series.
I'm convinced that 3,840 is.
175175
15
30
184
The pattern is - 5 then +2. 2 and 4 are the next numbers in the series.
184
6
59 is the next number in this series.