244 1x3=3, 3x3=9, 9x3=27, 27x3=81, 81x3=244
If you mean: 1 3 9 27 81 then it is 3*81 = 243
59 is the next number in this series.
The next number in the series is 13112221.
There is no series: one number, however large, does not make a series.
The next number in the series is 67.
hat is the next number in the series: 60 30 20 15 12
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!
I don't know if this will help: 139+139=278 (the first two 3 digit number sequences) 139 x 20=2780 (thats the closest i could get to 2781) if you take 139 and times it by the first even number (2) you get 278, multply 278 by the next even number (4) you get 1112 so, I would answer 1.
Look at the difference between each number and the next number.
The next number is -57
The next number is 1112.
The sum of the previous two numbers in the series.
3467910 is a single number: it is not a pattern!