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The Fibonatetris, coined by SuperJedi224, is equal to the trillionth term of the fibonacci sequence (tetris being a modified form of the SI Tera-, for one trillion), starting with the first one.

It has exactly 208,987,640,250 digits.

Its prime factorization starts with 3 × 512 × 7 × 11 × 41 × 47 × 101 × 127 × 151 × 251 × 401 × 641 × 1087 × 1601 × 2161 × 2207 × 3001 × 3041 × 4001 × 4481 × 9601 × …

## Approximations in other notationsEdit

Notation Lower bound Upper bound
Scientific notation $$4\times10^{208\,987\,640\,249}$$ $$5\times10^{208\,987\,640\,249}$$
Arrow notation $$26\uparrow147\,697\,227\,336$$ $$416\uparrow79\,793\,888\,139$$
Down-arrow notation $$526\downarrow\downarrow5$$ $$157\downarrow\downarrow6$$
Steinhaus-Moser Notation 10[3][3] 11[3][3]
Copy notation 1[1[12]] 2[2[12]]
Chained arrow notation $$26→147\,697\,227\,336$$ $$416→79\,793\,888\,139$$
H* function H(69H(2)) H(70H(2))
Taro's multivariable Ackermann function A(3,A(3,36)) A(3,A(3,37))
Pound-Star Notation #*((1))*(36)*3 #*((1))*(37)*3
BEAF {26,147697227336} {416,79793888139}
Hyper-E notation 4E208,987,640,249 5E208,987,640,249
Bashicu matrix system (0)(1)[35] (0)(1)[36]
Hyperfactorial array notation (13!)! (14!)!
Fast-growing hierarchy $$f_2(f_2(34))$$ $$f_2(f_2(35))$$
Hardy hierarchy $$H_{\omega^22}(34)$$ $$H_{\omega^22}(35)$$
Slow-growing hierarchy $$g_{\omega^{\omega^{\omega+1}2}}(10)$$ $$g_{\omega^{\omega^{\omega+1}2+\omega^\omega}}(10)$$

Source: [1]