a(1) =4, a(n) = smallest multiple of a(n-1) (not equal to 10^k*a(n-1)) obtained by inserting digits anywhere in a(n-1).
A080489
a(1) =4, a(n) = smallest multiple of a(n-1) (not equal to 10^k*a(n-1)) obtained by inserting digits anywhere in a(n-1).
Terms
- a(0) =4a(1) =24a(2) =264a(3) =20064a(4) =12560064a(5) =125613200064
External references
- oeis: A080489