X=1,Y=3,X=2,Y=6,X=3,Y=3,X=4 Y=? X=5 Y=? X = 100 Y=?

Not enough information..... But I'd guess the sequence of Y is repeating 3, 6 , 3 , 6.......

So X=4 Y=6 X=5 Y=3 X=100 Y=6.

:)