Sha256: a5c88c754932477992190a1825a51b2f92d6318d65a9000831902c83f99851e0
Contents?: true
Size: 560 Bytes
Versions: 11
Compression:
Stored size: 560 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
(prime? ? self : prev_prime).downto(2).select(&:prime?).reduce(:*)
end
end
Version data entries
11 entries across 11 versions & 1 rubygems