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Contents
describe Integer, "#k_perfect?" do
@seq = {
# A005820
3 => [120,672,523776,459818240,1476304896,51001180160].to_seq,
# A027687
4 => [30240,32760,2178540,23569920,45532800,142990848,
1379454720,43861478400,66433720320].to_seq
}
# A007539
@first_seq = [1, 6, 120, 30240, 14182439040, 154345556085770649600,
141310897947438348259849402738485523264343544818565120000,
8268099687077761372899241948635962893501943883292455548843932421413884476391773708366277840568053624227289196057256213348352000000000].to_seq
@first_seq.each_with_index.first(5).sample(2).each do |n, i|
k = i + 1
it "should return true for #{k}-perfect number #{n}" do
n.k_perfect?(k).should be_true
end
it "should return false for a number k-perfect for a different k, e.g. (#{n}, #{k+1})" do
n.k_perfect?(k+1).should be_false
end
end
@seq.each do |k, members|
members.sample(2).each do |n|
it "should return true for #{k}-perfect number #{n}" do
n.k_perfect?(k).should be_true
end
end
members.invert.sample(1).each do |n|
it "should return false for non-#{k}-perfect number #{n}" do
n.k_perfect?(k).should be_false
end
end
end
end
Version data entries
20 entries across 20 versions & 1 rubygems