Sextexep is equal to \(f_{\varepsilon_0^6}(10)\) using the fast-growing hierarchy. The term was coined by wiki user Denis Maksudov. It is equal to \(f_{\omega^{\varepsilon_06}}(10)=f_{\varphi_0(\varphi_1(0)\cdot 6)}(10)\) using the Veblen function \(\varphi_\alpha(\beta)\).