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BusyBeaver(6) Is Quite Large

(scottaaronson.blog)
271 points bdr | 1 comments | 28 Jun 25 16:53 UTC | HN request time: 0.279s | source
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sedatk ◴[28 Jun 25 17:50 UTC] No.44406683[source]▶
> Also, the left-superscript means tetration, or iterated exponentiation: for example, 1510 means 10 to the 10 to the 10 and so on 15 times.

I thought it was a typo. First time I encounter tetration.

replies(2): >>44407005 #>>44408544 #
1. lbourdages ◴[28 Jun 25 22:05 UTC] No.44408544[source]▶
I've seen it before, but it was using Knuth's up-arrow notation [1], which I like because it generalizes easily.

[1] https://en.wikipedia.org/wiki/Knuth's_up-arrow_notation