Sha256: 072e55d7dfff7104641a51fd4fe4c8386b6765980c369784a9a48d848e0b2c76
Contents?: true
Size: 563 Bytes
Versions: 31
Compression:
Stored size: 563 Bytes
Contents
# coding: utf-8
class Integer
# An equidigital number has the same number of digits as
# the number of digits in its prime factorization (including exponents).
#
# For example, 35 is equidigital because it has two digits and two 1-digit
# prime factors (5 and 7).
#
# Returns true if self is equidigital; false otherwise.
#
# 81.equidigital? #=> true
# 49.equidigital? #=> true
# 1287.equidigital? #=> false
#
def equidigital?
digits.size == prime_division.flatten.reject{|d|d==1}.join.to_i.digits.size
end
end
Version data entries
31 entries across 31 versions & 1 rubygems