Sha256: 1ae35e411a7d72e9ae999358b23fa8ec5919c011b8bab6d1f6bade6470a004f4
Contents?: true
Size: 581 Bytes
Versions: 9
Compression:
Stored size: 581 Bytes
Contents
require 'prime'
class Integer
def primorial?
return true if self == 1
pd = prime_division
(pd.map{|b,e| e}.uniq == [1]) and (pd.map{|b,e| b} == Prime.first(pd.size))
end
def primorial_product?
return true if primorial?
return false if prime?
divisors.each_slice(2).
reject{|pair| pair == [1, self]}.
any?{|pair| pair.all?(&:primorial_product?)}
end
def primorial
return nil if self < 1
return 1 if self == 1
if prime?
self * (self - 1).primorial
else
(self - 1).primorial
end
end
end
Version data entries
9 entries across 9 versions & 1 rubygems