shokai https://blog.hatena.ne.jp/shokai/ 橋本詳解 https://shokai.hatenadiary.org/ OneLiner Ruby みょうにシンプルにできたので書いておく ruby -e 'p 2.upto(ARGV[0].to_i).to_a.delete_if{|i| 2.upto(i/2).to_a.detect{|j|i%j == 0} }' 2000[2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fshokai.hatenadiary.org%2Fentry%2F20111225%2F1324777283" title="nまでの素数を求める - 橋本詳解" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2011-12-25 10:41:23 rich https://shokai.hatenadiary.org/entry/20111225/1324777283 1.0 100%