Sha256: 0b7f6942cf3e026bc3e996efb818055384c165e0982473cc6dc9022a8e06a565
Contents?: true
Size: 467 Bytes
Versions: 49
Compression:
Stored size: 467 Bytes
Contents
# encoding: utf-8
require 'prime'
class Integer
# Returns true if value is palindromic prime, false for a composite.
#
# === Example
#
# 0.palindromic_prime? # => false
# 1.palindromic_prime? # => false
# 2.palindromic_prime? # => true
# 11.palindromic_prime? # => true
# 757.palindromic_prime? # => true
# 758.palindromic_prime? # => false
#
def palindromic_prime?
prime? && to_s == to_s.reverse
end
end
Version data entries
49 entries across 49 versions & 1 rubygems