mastodon.zunda.ninja is one of the many independent Mastodon servers you can use to participate in the fediverse.
Zundon is a single user instance as home of @zundan as well as a test bed for changes of the code.

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zunda

がーん。せっかく4年に1度なのに。

$ ruby primedate.rb
今日20240229は素数日じゃないかもしれない
$ ruby -rprime -e 'p 20240229.prime_division'
[[3, 1], [43, 1], [156901, 1]]

そっか…