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| Language | Ruby |
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| Owner | Anonymous |
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require 'prime'
lucas = Hash.new { |h, k| h[k] = h[k-1] + h[k-2] }
lucas[1] = 1
lucas[2] = 3
lucas_prime = -> n { (lucas[n] - 1) % n == 0 }
2.upto(Float::INFINITY).
lazy.
select { |n| n.prime? != lucas_prime[n] }.
each &method(:p)
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