4 Tetrated
From charlesreid1
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Mathematical Constants
Irrational Numbers: Euler-Mascheroni Constant · Sqrt2 · Phi · Sqrt3 · e · Sqrt5 · Sqrt6 · Sqrt7 · Sqrt8 · Pi · Sqrt10 · Pi to the Pi Prime Numbers: Prime Numbers · Palindromic Primes · Prime Generating Polynomials · Belphegors Prime Sequences: Fibonacci Numbers · Lucas Numbers · General Fibonacci Numbers Number Forms: Fermat Numbers · Mersenne Primes · Counting and Combinatorics: Catalan Numbers · Shannon Number · Eddington Number Tetration and Knuth's Up Notation: Tetration Factoring and Number Theory: Divisibility · Totient Function Games: Four Fours · Five Fives
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See Tetration
Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://en.wikipedia.org/api/rest_v1/":): {\displaystyle 4^{4^{4^{4}}} = 4^{4^{256}} = 4^{ 13407807929942597099574024998205846127479365820592393377723561443721764030073546976801874298166903427690031858186486050853753882811946569946433649006084096 }}