The next number is 9. The sequence is - starting with the 1st digit, you add 2 each time. Starting at the 2nd digit, each number is a square. Therefore the next two numbers would be 9 (7+2) and 25 (5x5)
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108
3467910 is a single number: it is not a pattern!
Look at the difference between each number and the next number.
The next number is -21
The next number in the series 1 2 4 8 10 20 22 is