@misc{Daudin2020,
  author    = {{Jean-Jacques Daudin}},
  title     = {{$3n+1$ problem: an heuristic lower bound for the number of integers connected to 1 and less than $x$}},
  year      = {{2020}},
  url       = {{https://arxiv.org/abs/2003.14153}},
  primaryclass= {{math.NT}},
  archiveprefix= {{arXiv}},
  eprint    = {{2003.14153}},
}