Sha256: 5272af4c197c06263fe75f27f8d1d3761a7b83e9d57e5be75f9826dcd032cf79
Contents?: true
Size: 742 Bytes
Versions: 6
Compression:
Stored size: 742 Bytes
Contents
# coding: utf-8
# A007448
KNUTH = [1,3,3,4,7,7,7,9,9,10,13,13,13,15,15,19,19,19,19,
21,21,22,27,27,27,27,27,28,31,31,31,39,39,39,39,
39,39,39,39,40,43,43,43,45,45,46,55,55,55,55,55,
55,55,55,55,57,57,58,63,63,63,63,63,64,67,67,67,
79,79,79,79]
describe Integer, "#knuth?" do
KNUTH.uniq.each do |n|
it "returns true for Knuth number #{n}" do
n.should be_knuth
end
end
KNUTH.uniq.to_seq.invert.sample(10).each do |n|
it "returns false for non-Knuth number #{n}" do
n.should_not be_knuth
end
end
end
describe Integer, "#knuth" do
KNUTH.each_with_index do |k, n|
it "returns #{k} as the #{n}#{n.ordinal} Knuth number" do
n.knuth.should == k
end
end
end
Version data entries
6 entries across 6 versions & 1 rubygems