Define the first two terms to be 1 and 7. All the other terms are obtained by concatenating the two previous terms.
A113765
Define the first two terms to be 1 and 7. All the other terms are obtained by concatenating the two previous terms.
Terms
- a(0) =1a(1) =7a(2) =17a(3) =717a(4) =17717a(5) =71717717
External references
- oeis: A113765