\log r\leq r-1
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Recent Referers:
  1. http://formula.s21g.com/?%5Clog%20r%5Cleq%20r-1
  2. https://mkprob.hatenablog.com/entry/20120722/1342959274
  3. http://formula.s21g.com/
  4. http://mkprob.hatenablog.com/?page=1343480443
  5. http://d.hatena.ne.jp/mkprob/201207