gistfile1.txt

PHI = (Math.sqrt(5.0) + 1) / 2
def rfib(a)
  l5 = Math.log(Math.sqrt(5.0))
  la = Math.log(a - (1 / Math.sqrt(5.0)))
  lp = Math.log(PHI)
  
  (la + l5) / lp
end

(1..10000).each do |i|
#  p "#{i} #{rfib(i)}"
  if rfib(i).to_i != rfib(i + 1).to_i then
    print "#{i} "
  end
end