HELP!!!! the input is 1 the output is 4 the input is 2 and the output is 7 the input is 3 and the output is 10 the input is 4 and the out put is 13 what is the rule????

Answer 1

THINK ITS
addition of an odd number
like
1+3=4
2+5=7
3+7=10
4+9=13

Answer 2

the rule is x3+1

Answer 3

input 1,2,3,4,5 output 3,5,9,17,33