Sha256: 6691b8b4b99e72ced30c022ecc1740fbdf65340f768c3d1a68c3035de4e1332a
Contents?: true
Size: 808 Bytes
Versions: 5
Compression:
Stored size: 808 Bytes
Contents
# coding: utf-8
# A005900
OCTAHEDRAL = [0,1,6,19,44,85,146,231,344,489,670,891,1156,1469,
1834,2255,2736,3281,3894,4579,5340,6181,7106,8119,
9224,10425,11726,13131,14644,16269,18010,19871,
21856,23969,26214,28595,31116,33781,36594,39559,
42680]
describe Integer, "#octahedral" do
OCTAHEDRAL.each_with_index do |o,n|
it "returns #{o} as the #{n}#{n.ordinal} octahedral number" do
n.octahedral.should == o
end
end
end
describe Integer, "#octahedral?" do
OCTAHEDRAL.each do |n|
it "returns true for octahedral number #{n}" do
n.should be_octahedral
end
end
OCTAHEDRAL.to_seq.invert.sample(100).each do |n|
it "returns false for non-octahedral number #{n}" do
n.should_not be_octahedral
end
end
end
Version data entries
5 entries across 5 versions & 1 rubygems