Answer:
1¹³ and 1¹⁵
Explanation:
The answer does not change however we add or reduce the exponents. This is the uniqueness of the integer 1. When the others are tried, 6¹=6 and 9¹=9
7⁸=5764801 and 8⁷=2097152
9²=81 and 4³=64
Therefore the integer 1 is the only number that is not affected by exponents.