19191919

Appears in sequences

• Numbers whose consecutive digits differ by 8.at n=28A048410
• Quadruplets: base 10 representation is the juxtaposition of four identical strings.at n=18A074843
• Numbers k such that the infinite sequence of digits consisting of the final digit of k^m for m = 2, 3, 4, ... is the same as the sequence of digits obtained by concatenating infinitely many copies of k.at n=33A344555