64646464

Appears in sequences

• a(1) = 999, a(n) is the number obtained by concatenating product of neighboring digits of the previous term.at n=6A110401
• 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=37A344555