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efaref
on May 16, 2018
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The fifth hyperfactorial: 5⁵×4⁴×3³×2²×1¹=86400000 ...
It's pure coincidence, but "pi seconds is a nanocentury" is a useful mnemonic.
Shadow6363
on May 16, 2018
[–]
Don't think Hacker News notifies you of sibling comments, but it's not actually pure coincidence. See my answer at
https://news.ycombinator.com/item?id=17084159
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