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


Notation Approximation
Arrow notation \(7 \uparrow\uparrow\uparrow 5 \uparrow\uparrow\uparrow 3 \uparrow\uparrow\uparrow 2\) (exact)
Hyper-E notation E[7]1#1#7625597484987#2
BEAF {7,{5,{3,2,3},3},3} (exact)
Hyperfactorial array notation ((15!)!2)!2
Fast-growing hierarchy \(f_4(f_4(f_2(37))))\)
Hardy hierarchy \(H_{\omega^42+\omega^2}(37)\)


  1. Numbers | Licorneuhh's numbers site (retrieved at UTC 12:20 13/02/2021)
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