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Sesquillion is a large noninteger defined by SuperJedi224 as equaling 103*1.5+3 = 107.5 ≈ 31622776.60168[1]. The name is derived from the prefix "sesqui-", meaning one and a half, and the suffix "-illion" as defined in the short scale. It is equal to the square root of one quadrillion.

The same name has also been suggested by John Savard as a long scale name for the short scale billion[2], which is equal to 106*1.5. It would be the 1.5th -illion in the long scale.

Approximations[]

Notation Lower bound Upper bound
Scientific notation \(3.162\times10^7\) \(3.163\times10^7\)
Arrow notation \(74\uparrow4\) \(75\uparrow4\)
Steinhaus-Moser Notation 8[3] 9[3]
Copy notation 2[8] 3[8]
Taro's multivariable Ackermann function A(3,21) A(3,22)
Pound-Star Notation #*(53)*4 #*(23)*5
BEAF {74,4} {75,4}
Hyper-E notation 3E7 4E7
Bashicu matrix system (0)[5623] (0)[5624]
Hyperfactorial array notation 10! 11!
Fast-growing hierarchy \(f_2(20)\) \(f_2(21)\)
Hardy hierarchy \(H_{\omega^2}(20)\) \(H_{\omega^2}(21)\)
Slow-growing hierarchy \(g_{\omega^7\times3}(10)\) \(g_{\omega^7\times2}(11)\)

Source[]

Numbers By SuperJedi224

Fibonacci Numbers

Pound-Star Notation

Based on the Faxul

Googovipleccix family

Graham Sequence Numbers

-Illion numbers

"-Illion" numbers by SuperJedi224

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