block3.rb

def f(x)
	
	c = 0
	t = x.to_s(2).length
	
	x2 = x
	l = []
	while (x >= x2)
		l << x.to_s(2)[0...(t-1)] if (c % (t - 1) == 0)
		
		x = x.even? ? x / 2 : x * 3 + 1
		c += 1
		
	end
	
	return l
	
end


p = ARGV[0].to_i

n = 2 ** p + 1
s1 = n.to_s(2).length

l2 = []
loop \
{
	break if (n.to_s(2).length != s1)
	l = f(n)
	if (l.size > 1) then
		l.each { |x| p(x.to_i(2)) }
	end
	n += 2
}