Sha256: 7e2d41b23d970561f612abedccb05498e3caa09ef914882ec9451278ab44c5c7
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Size: 514 Bytes
Versions: 11
Compression:
Stored size: 514 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 positive?
σ < (2 * self)
end
alias :defective? :deficient?
end
Version data entries
11 entries across 11 versions & 1 rubygems