# math

posted by
**noah**
.

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 thanks

posted by
**noah**
.

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 thanks