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Contents
describe Integer, "#dihedral_prime?" do
# A038136
@seq = ([2,11,101,181,1181,1811,18181,108881,110881,
118081,120121,121021,121151,150151,151051,151121,
180181,180811,181081,188011,188801,1008001,
1022201,1028011,1055501,1058011,1082801,1085801,
1088081] +
# A134996
[2,5,11,101,181,1181,1811,18181,108881,110881,
118081,120121,121021,121151,150151,151051,151121,
180181,180811,181081,188011,188801,1008001,
1022201,1028011,1055501,1058011,1082801,1085801,
1088081]).uniq.to_seq
@seq.each do |n|
it "returns true for Dihedral prime #{n}" do
n.should be_dihedral_prime
end
end
@seq.invert.sample(100).each do |n|
it "returns false for non-Dihedral-prime #{n}" do
n.should_not be_dihedral_prime
end
end
[3, 7, 9].each do |n|
it "returns false for #{n} which is a prime but not Dihedral" do
n.should_not be_dihedral_prime
end
end
[8, 808, 1101].each do |n|
it "returns false for #{n} which is Dihedral and composite" do
n.should_not be_dihedral_prime
end
end
end
Version data entries
14 entries across 14 versions & 1 rubygems