qiita.com 素朴にやる b, c = ARGV.map(&:to_i) tm = Time.now nxt = 1 + c b1 = 1 s, t = 0, 1 (0..).each do |n| break if Time.now - tm > 1.0 if nxt == n str = s.to_s result = "f(#{n})=" result << if (l = str.length) <= 5 str else str[0, 2] + "…