Heads-Pent-2-primol is a number equal to R**(5) using Primarial Functions. It is equal to 11↑↑7↑↑5↑↑3↑↑2 (=11↑↑7↑↑5↑↑27 or 11↑↑R**(4)). The term was coined by Licorneuhh.[1]

Approximations

Notation Lower bound Upper bound
Arrow notation \(11 \uparrow\uparrow 7 \uparrow\uparrow 5 \uparrow\uparrow 27\)
Hyper-E notation E[11]1#(E[7]1#(E[5]1#27))
BEAF {11,{7,{5,27,2},2},2}
Hyperfactorial array notation ((28!1)!1)!1 ((29!1)!1)!1
Fast-growing hierarchy \(f_3(f_3(f_3(25)))\) \(f_3(f_3(f_3(26)))\)
Hardy hierarchy \(H_{\omega^3}(H_{\omega^3}(H_{\omega^3}(26)))\) \(H_{\omega^3}(H_{\omega^3}(H_{\omega^3}(27)))\)
Slow-growing hierarchy \(g_{\varepsilon_0}(g_{\varepsilon_0}(g_{\varepsilon_0}(26)))\) \(g_{\varepsilon_0}(g_{\varepsilon_0}(g_{\varepsilon_0}(27)))\)

References

  1. Numbers | Licorneuhh's numbers site (retrieved at UTC 19:34 14/01/2021)
Community content is available under CC-BY-SA unless otherwise noted.