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The septoogol is equal to {10,10,10,10,10,10,10,100} in BEAF.[1] The term was coined by Jonathan Bowers.

Username5243 calls this number Ectoogol (formerly Zettoogol), and it's equal to 10[0,0,0,0,0,0,1]100 in Username5243's Array Notation.[2]

## Etymology

The name of the number is based on Latin prefix "septi-" and the number "googol".

## Approximations

Notation Approximation
Bird's array notation $$\{10,10,10,10,10,10,10,100\}$$ (exactly equal)
Hyper-E notation $$E100\#\#\#\#\#\#\#101$$
Fast-growing hierarchy $$f_{\omega^6}(100)$$
Hardy hierarchy $$H_{\omega^{\omega^6}}(100)$$
Slow-growing hierarchy $$g_{\varphi(99,99,99,99,99,99,0)}(100)$$

## Sources

1. Bowers, JonathanInfinity Scrapers. Retrieved January 2013.
2. Username5243. shortened list - My Large Numbers. Retrieved 2018-02-20.

Jonathan Bowers' googol series

Googol series: googol(plex/duplex/triplex/quadraplex) · giggol(plex/duplex) · gaggol(plex/duplex) · geegol(plex) · gigol(plex) · goggol(plex) · gagol(plex)
Boogol series: boogol(plex/duplex/triplex) · biggol(plex/duplex) · baggol(plex) · beegol(plex) · bigol(plex) · boggol(plex) · bagol(plex)
Troogol series: troogol(plex/duplex) · triggol(plex) · traggol(plex) · treegol(plex) · trigol(plex) · troggol(plex) · tragol(plex)