Sha256: e100563c6fa0c0e4223621f3836373b684d611969a7e5c50172c010511e6dc5e
Contents?: true
Size: 536 Bytes
Versions: 11
Compression:
Stored size: 536 Bytes
Contents
# coding: utf-8
class Integer
# An abundant number is a number n for which σ(n) > 2n. That is, the sum of
# its divisors exceeds 2n. (See Integer#σ to compute the sum of the divisors
# of an arbitrary integer).
#
# Returns true if the number is abundant; false otherwise. Aliased to
# Integer#excessive?.
#
# 96.abundant? #=> true
# 100.abundant? #=> true
# 345.abundant? #=> false
#
def abundant?
return false unless positive?
σ > (2 * self)
end
alias :excessive? :abundant?
end
Version data entries
11 entries across 11 versions & 1 rubygems