Sha256: c1d2b726bab393e86a9bf4883968203cc7387a6357004d992513486ffde4bcb4
Contents?: true
Size: 792 Bytes
Versions: 5
Compression:
Stored size: 792 Bytes
Contents
# A002203
PELL_LUCAS = [2,2,6,14,34,82,198,478,1154,2786,6726,16238,
39202,94642,228486,551614,1331714,3215042,7761798,
18738638,45239074,109216786,263672646,636562078,
1536796802,3710155682,8957108166,21624372014,
52205852194]
describe Integer, "#pell_lucas?" do
PELL_LUCAS.each do |n|
it "returns true for Pell-Lucas number #{n}" do
n.should be_pell_lucas
end
end
PELL_LUCAS.to_seq.invert.sample(10).each do |n|
it "returns false for non-Pell-Lucas number #{n}" do
n.should_not be_pell_lucas
end
end
end
describe Integer, "#pell_lucas" do
PELL_LUCAS.each_with_index do |l, n|
it "returns #{l} for the #{n}#{n.ordinal} Pell-Lucas number" do
n.pell_lucas.should == l
end
end
end
Version data entries
5 entries across 5 versions & 1 rubygems