https://old.reddit.com/r/counting/comments/1te0qs4/only_repeating_digits_6_644_000/ow8n19l/?context=3
6677336
6677337
6677363
6677373
6677444
6677446
6677447
6677464
6677474
6677555
6677556
6677557
6677565
6677575
6677600
6677611
6677622
6677633
6677644
6677655
6677666
6677667
6677676
6677677
6677688
6677699
6677700
6677711
6677722
6677733
6677744
6677755
6677766
6677767
6677776
6677777
6677788
6677799
6677868
6677878
6677886
6677887
6677888
6677969
6677979
6677996
6677997
6677999