10 lines
208 B
Ruby
10 lines
208 B
Ruby
|
require 'prime'
|
||
|
|
|
||
|
|
def μ(n)
|
||
|
|
pd = n.prime_division
|
||
|
|
return 0 unless pd.map(&:last).all?(1)
|
||
|
|
pd.size.even? ? 1 : -1
|
||
|
|
end
|
||
|
|
|
||
|
|
([" "] + (1..199).map{|n|"%2s" % μ(n)}).each_slice(20){|line| puts line.join(" ") }
|