Sha256: 0f6ed04007bf844596278349586b8362cdd760bdc8c4008446d910df7951c981
Contents?: true
Size: 526 Bytes
Versions: 16
Compression:
Stored size: 526 Bytes
Contents
# coding: utf-8
class Integer
# A deficient number is a number n for which σ(n) < 2n. That is, the sum of
# its divisors are less than the number. (To calculate the sum of divisors
# for an arbitrary integer see Integer#σ).
#
# Returns true if the number is deficient; false otherwise.
#
# 8.deficient? #=> true
# 27.deficient? #=> true
# 6.deficient? #=> false
#
def deficient?
return false unless self > 0
sum_of_divisors < (2 * self)
end
alias :defective? :deficient?
end
Version data entries
16 entries across 16 versions & 1 rubygems