Created by cia_rana last modified 2017-05-27

codeiq.3182.fast.rb

      require "prime"
f=gets.to_f
p (1..(1/f-f/3).to_i).map{|i|(i*i+1).prime_division(Prime::EratosthenesGenerator.new).map{|_,e|e+1}.reduce(:*)/2}.inject :+

    

codeiq.3182.rb

      # 1/tan(x) = cot(x) ~ 1/x-x/3
require "prime"
f=gets.to_f
p (1..(1/f-f/3).to_i).inject(0){|s,i|s+=((i*i)+1).prime_division.inject(1){|d,e|d*=e[1]+1}/2}

    

Comments (1)

cia_rana

1/tan(x) = cot(x) ~ 1/x-x/3
とすると
[0.464, 0.786, 0.787, 0.788, 0.789, 0.790, 0.791]
がうまくいかない
- 2017-05-27T19:32:55+00:00

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