2*2 = 4 + 1 (5)
5*2=10-1 (9)
9*2=18+1 (19)
19*2=38-1 (37)
37*2=74-1 (75)
So, its "75" :)
59 is the next number in this series.
The next number in the series is 67.
A single number such as 61205041320 does not make a series.
A single number, such as 12848384 does not make a series.
One number does not make a sequence (nor a series).
There is no series of number: just one very large number!
8
243
20
73791170
25
108