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13 & 21
fibonacci
108
Look at the difference between each number and the next number.
3467910 is a single number: it is not a pattern!
There are many possible answers. One obvious one is 13, the next number in the Fibonacci Sequence that yields the golden mean.
1+1 = 2 1+2 = 3 2+3 = 5 3+5 = 8 5+8 = 13
13 & 21
112358 = 112,358
Not enoug information is given to provide an answer.
59 is the next number in this series.
The next number in the series is 67.
fibonacci
A single number such as 61205041320 does not make a series.
A single number, such as 12848384 does not make a series.
fibonacci
One number does not make a sequence (nor a series).