Answer :

powers 1 2 3    4  5        6 
values  3 9 27 81 243 729

3 to the power of zero = 1
3 to the power of one = 3
3 to the power of two = 9
3 to the power of three = 27
3 to the power of four = 81
3 to the power of five = 243
3 to the power of six = 729