Heads-Pent-3-primol is a number equal to R***(5) using Primarial Functions. It is equal to 11↑↑↑7↑↑↑5↑↑↑3↑↑↑2 (=11↑↑↑7↑↑↑5↑↑↑7625597484987 or 11↑↑↑R***(4)). The term was coined by Licorneuhh.[1]


Notation Approximation
Arrow notation \(11 \uparrow\uparrow\uparrow 7 \uparrow\uparrow\uparrow 5 \uparrow\uparrow\uparrow 3 \uparrow\uparrow\uparrow 2\) (exact)
Hyper-E notation E[11]1#1#7625597484987#3
BEAF {11,{7,{5,{3,2,3},3},3},3} (exact)
Hyperfactorial array notation (((15!)!2)!2)!2
Fast-growing hierarchy \(f_4(f_4(f_4(f_2(37))))\)
Hardy hierarchy \(H_{\omega^43+\omega^2}(37)\)


  1. Numbers | Licorneuhh's numbers site (retrieved at UTC 14:17 13/02/2021)
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