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Contents
describe Integer, "#e_divisors" do
# A051377
@sums = [1,2,3,6,5,6,7,10,12,10,11,18,13,14,15,22,17,24,
19,30,21,22,23,30,30,26,30,42,29,30,31,34,33,34,
35,72,37,38,39,50,41,42,43,66,60,46,47,66,56,60,
51,78,53,60,55,70,57,58,59,90,61,62,84,78,65,66,
67,102,69,70,71]
# A049419
@counts = [1,1,1,2,1,1,1,2,2,1,1,2,1,1,1,3,1,2,1,2,1,1,1,2,
2,1,2,2,1,1,1,2,1,1,1,4,1,1,1,2,1,1,1,2,2,1,1,3,2,
2,1,2,1,2,1,2,1,1,1,2,1,1,2,4,1,1,1,2,1,1,1,4,1,1,
2,2,1,1,1,3,3,1,1,2,1,1,1,2,1,2,1,2,1,1,1,2,1,2,2,
4,1,1]
# A157488
@products = [1,2,3,8,5,6,7,16,27,10,11,72,13,14,15,128,17,
108,19,200,21,22,23,144,125,26,81,392,29,30,31,64,33,34,
35,46656,37,38,39,400,41,42,43,968,675,46,47,3456,343,500,
51,1352,53,324,55,784,57,58,59,1800,61,62,1323,4096]
@counts.to_enum.with_index(1) do |count, n|
e_divisors = n.e_divisors
it "returns #{count} e divisors for #{n}" do
e_divisors.size.should == count
end
if sum = @sums[n-1]
it "returns e divisors with a sum of #{sum} for #{n}" do
e_divisors.reduce(:+).should == sum
end
end
if product = @products[n-1]
it "returns e divisors with a product of #{product} for #{n}" do
e_divisors.reduce(:*).should == product
end
end
end
end
Version data entries
7 entries across 7 versions & 1 rubygems