Sha256: 3fa2892ed53f607dce2eefc5bcf2a252ac65fd0f13785858e12b1b1778f19ed4
Contents?: true
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Versions: 20
Compression:
Stored size: 1.14 KB
Contents
describe Integer, "#economical?" do
@seq = {
# A046759
:frugal => [125,128,243,256,343,512,625,729,1024,1029,1215,
1250,1280,1331,1369,1458,1536,1681,1701,1715,1792,
1849,1875,2048,2187,2197,2209,2401,2560,2809,3125,
3481,3584,3645,3721,4096,4374,4375,4489,4802,
4913],
# A046758
:equidigital => [1,2,3,5,7,10,11,13,14,15,16,17,19,21,23,25,27,29,
31,32,35,37,41,43,47,49,53,59,61,64,67,71,73,79,
81,83,89,97,101,103,105,106,107,109,111,112,113,
115,118,119,121,122,123,127,129,131,133,134,135,
137,139]
}
@seq.each do |type, seq|
seq.each do |n|
it "should return true for #{type} number #{n}" do
n.should be_economical
end
end
end
(@seq[:equidigital] + @seq[:frugal].select{|e| e <= @seq[:equidigital].last}).
to_seq.invert.sample(10).each do |n|
it "should return false for non-economical number #{n}" do
n.should_not be_economical
end
end
end
Version data entries
20 entries across 20 versions & 1 rubygems