Sha256: 2274890ba49eba96a50cb44030d0a1e07ee76995da5ca0e597b4e817359dc4d5
Contents?: true
Size: 762 Bytes
Versions: 16
Compression:
Stored size: 762 Bytes
Contents
describe Integer, "emrip?" do
# http://www.research.att.com/~njas/sequences/A006567
EMRIP = [13,17,31,37,71,73,79,97,107,113,149,157,167,179,
199,311,337,347,359,389,701,709,733,739,743,751,
761,769,907,937,941,953,967,971,983,991,1009,1021,
1031,1033,1061,1069,1091,1097,1103,1109,1151,1153,
1181,1193]
it "returns true for primes that give a different prime when reversed" do
EMRIP.each do |number|
number.should be_emrip
end
end
it "returns false for non-emrips" do
((1..1193).to_a - EMRIP).each do |number|
number.should_not be_emrip
end
end
it "returns false for palindromic primes" do
[11,151].each do |number|
number.should_not be_emrip
end
end
end
Version data entries
16 entries across 16 versions & 1 rubygems