1.
If a1a \neq 1 and lna2+(lna2)2+(lna2)3+=3(lna+(lna)2+(lna)3+)\ln a^2 + (\ln a^2)^2 + (\ln a^2)^3 + \cdots = 3\bigl(\ln a + (\ln a)^2 + (\ln a)^3 + \cdots\bigr), then aa is equal to