Dihexar is equal to \(Q_{1,1}(6)\) in the Q-supersystem.[1] The term was coined by Boboris02.

The number can be computed like this:

  • \(t_{1}=6\uparrow\uparrow\uparrow\uparrow 6\), aka Hexar.
  • \(t_{2}=6\uparrow^{t_{1}-2} 6\).
  • \(t_{n}=6\uparrow^{t_{n-1}-2} 6\).
  • Dihexar is equal to \(t_6\).


The name comes from the number "Hexar" and "di", meaning two.


Notation Approximation
Up-arrow notation \(6\uparrow^{6\uparrow^{6\uparrow^{6\uparrow^{6\uparrow^{6\uparrow^{4} 6} 6} 6} 6} 6} 6\)
Chained arrow notation \(6\rightarrow 6\rightarrow 6\rightarrow 2\)
Fast-growing hierarchy (using CNF's fundamental sequences) \(f_{\omega+1}(6)\)
Hardy hierarchy \(H_{\omega^{\omega+1}}(6)\)
BEAF \(\{6,6,\{6,6,\{6,6,\{6,6,\{6,6,\{6,6,4\}\}\}\}\}\}\)
Hyperfactorial array notation \(8!(8!(8!(8!(8!(8!3)))))\)
Notation Array Notation \((6\{2,(6,\{2,(6,\{2,(6,\{2,(6,\{2,(6\{2,4\}6)\}6)\}6)\}6)\}6)\}6)\)


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