Sha256: aa06e17a280747bac514eda5b92c46268634fdc908a90b5a6d2d34aa8139294e
Contents?: true
Size: 539 Bytes
Versions: 22
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Stored size: 539 Bytes
Contents
describe Integer, "#octagonal?" do
#A000567
OCTAGONAL = [0,1,8,21,40,65,96,133,176,225,280,341,408,481,
560,645,736,833,936,1045,1160,1281,1408,1541,1680,
1825,1976,2133,2296,2465,2640,2821,3008,3201,3400,
3605,3816,4033,4256,4485,4720,4961,5208,5461]
it "returns true for octagonal numbers" do
OCTAGONAL.each{|n| n.should be_octagonal}
end
it "returns false for non-octagonal numbers" do
((0..OCTAGONAL.last).to_a - OCTAGONAL).each{|n| n.should_not be_octagonal}
end
end
Version data entries
22 entries across 22 versions & 1 rubygems