What is the rule for this function?

input 1 output 3
input 2 output 5
Input 4 output 9
Input 5 output 11
Input 10 output 21
Input 12 output 25

Please help now thanks

9 answers

It is like adding
+9 then-7
y (output)
x(input)

y=2x+1
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Imput (x) rule output(y)

1
5
10
20
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if the input is 3 and the output is 24 then what is the rule?
3×8
About to kms