Indefinite Integration

$\frac{7^{7^x}}{(\log 7)^3}+\mathrm{k}$, where k is constant of integration

$\frac{7^{7^{7^x}}}{\log 7}+\mathrm{k}$, where k is constant of integration

$\frac{7^{7^{7^x}}}{(\log 7)^3}+\mathrm{k}$, where k is constant of integration

$7^{7^{7^x}}(\log 7)^3+\mathrm{k}$, where k is constant of integration