Sha256: fde775c19cee2670682598de22a8d4bf4d998aadfc690a543cf6fcf4580452b7
Contents?: true
Size: 888 Bytes
Versions: 5
Compression:
Stored size: 888 Bytes
Contents
# A014551
JACOBSTHAL_LUCAS = [2,1,5,7,17,31,65,127,257,511,1025,2047,4097,8191,
16385,32767,65537,131071,262145,524287,1048577,
2097151,4194305,8388607,16777217,33554431,
67108865,134217727,268435457,536870911,1073741825,
2147483647]
describe Integer, "#jacobsthal_lucas?" do
JACOBSTHAL_LUCAS.each do |n|
it "returns true for Jacobsthal-Lucas number #{n}" do
n.should be_jacobsthal_lucas
end
end
JACOBSTHAL_LUCAS.to_seq.invert.sample(10).each do |n|
it "returns false for non-Jacobsthal-Lucas number #{n}" do
n.should_not be_jacobsthal_lucas
end
end
end
describe Integer, "#jacobsthal_lucas" do
JACOBSTHAL_LUCAS.each_with_index do |l, n|
it "returns #{l} for the #{n}#{n.ordinal} Jacobsthal-Lucas number" do
n.jacobsthal_lucas.should == l
end
end
end
Version data entries
5 entries across 5 versions & 1 rubygems