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In pound-star notation, the Astragol is equal to #*(10,10)*100.[1] It is equal to 101*1,010101, or about 2.8*10305. The term was coined by SuperJedi224.

## Etymology

The "Astra-" prefix means "star". The "-gol" ending is primarily a reference to the Googol and its relatives.

## Decimal expansion

275918058739289876774186532449476220343486494427490093270569409020435525474430473895618908023511415725192097968130783910105600919330345759782904298408476021327859237750488362140269551052569400682925152020100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

## Approximations

Notation Lower bound Upper bound
Scientific notation $$2.759\times10^{305}$$ $$2.76\times10^{305}$$
Arrow notation $$598\uparrow110$$ $$408\uparrow117$$
Steinhaus-Moser Notation 141[3] 142[3]
Copy notation 2[306] 3[306]
Chained arrow notation $$598\rightarrow110$$ $$408\rightarrow117$$
PlantStar's Debut Notation [181] [182]
Taro's multivariable Ackermann function A(3,1011) A(3,1012)
BEAF {598,110} {408,117}
Hyper-E notation 2E305 3E305
Bashicu matrix system (0)(0)(0)(0)(0)(0)[59225] (0)(0)(0)(0)(0)(0)[59226]
Hyperfactorial array notation 169! 170!
Bird's array notation {598,110} {408,117}
Fast-growing hierarchy $$f_2(1004)$$ $$f_2(1005)$$
Hardy hierarchy $$H_{\omega^2}(1004)$$ $$H_{\omega^2}(1005)$$
Slow-growing hierarchy $$g_{\omega^{\omega+71}53}(86)$$ $$g_{\omega^{\omega2+7}52}(77)$$

## Sources

1. Pound Star Notation Numbers - Almost Infinite (retrieved at 3/10/2021 08:49 UTC)

Numbers By SuperJedi224

Fibonacci Numbers

Level One

Level Two

#*

#**

H#*

#*{}

#*<<>>

H#*<<>>

Bingol series

Based on the Faxul

Other factorials

Googovipleccix family

Graham Sequence Numbers

-Illion numbers