The next number is 16. Counting forward from the first 1 - every other number is an increment of 1. From the second 1 - every other number is the square of the number it follows. Therefore the next number is 16, then 5, then 25, then 6... and so on...
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You add two then take one. 1+2=3, 3-1=2, 2+2=4, 4-1=3. The next number is 5.
The next number is 4, followed by -2
Correct. For example: 1 + 1 = 2 2 + 1 = 3 3 + 1 = 4
4.
The third number is 2 -- the first number is 1, second is 1, next is 1+1=2, then 1+2=3, 2+5=5 etc.