Oh, dude, let me put on my math hat for a sec. So, if we look at the pattern here, it's like adding 5, then subtracting 2, then adding 5 again, subtracting 2... you get the drift. So, the next number would be 24, because we just keep playing this fun little game of addition and subtraction. Math can be a real rollercoaster, huh?
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.
59 is the next number in this series.
One number does not make a sequence (nor a series).
243
The next number is 1112.
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.
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!
73791170
8
243
25
108