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Contents
describe Integer, "#semiprime?" do
# http://www.research.att.com/~njas/sequences/A001358
SEMI_PRIME = [4,6,9,10,14,15,21,22,25,26,33,34,35,38,39,46,49,
51,55,57,58,62,65,69,74,77,82,85,86,87,91,93,94,
95,106,111,115,118,119,121,122,123,129,133,134,
141,142,143,145,146,155,158,159,161,166,169,177,
178,183,185,187]
it "returns true for semi-prime numbers" do
SEMI_PRIME.each do |number|
number.should be_semiprime
end
end
it "returns false for non-semi-prime numbers" do
((1..187).to_a - SEMI_PRIME).each do |number|
number.should_not be_semiprime
end
end
end
Version data entries
36 entries across 36 versions & 1 rubygems