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Contents
describe Integer, "#sphenic?" do
# http://www.research.att.com/~njas/sequences/A007304
SPHENIC = [30,42,66,70,78,102,105,110,114,130,138,154,165,
170,174,182,186,190,195,222,230,231,238,246,255,
258,266,273,282,285,286,290,310,318,322,345,354,
357,366,370,374,385,399,402,406,410,418,426,429,
430,434,435,438]
it "returns true for sphenic numbers" do
SPHENIC.each do |number|
number.should be_sphenic
end
end
it "returns false for non-sphenic numbers" do
((1..438).to_a - SPHENIC).each do |number|
number.should_not be_sphenic
end
end
end
Version data entries
36 entries across 36 versions & 1 rubygems