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  1. require 'prime'
  2.  
  3. num=10000
  4. can=(1..num).to_a.count{|x| x.prime_division.all?{|x| x[0]%4!=3 || x[1]%2==0 } }
  5. puts num
  6. puts can
  7. x=1.0
  8. y=0
  9. Prime.each(100000) do |prime|
  10.   if prime%4==3
  11.   	x=x*(1.0*prime-1)/prime
  12.   end
  13.   y=prime
  14. end
  15. puts x
  16. puts y
Success #stdin #stdout 0.12s 8940KB
comments (?)
stdin 
Standard input is empty
stdout 
10000
2749
0.2560932336054222
99991
https://ideone.com/N6cO8C
language:
Ruby (ruby 2.5.5)
created:
10 days ago
visibility:
public

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