a(1) = 4, a(n) = smallest palindromic nontrivial multiple of a(n-1) containing all decimal digits of a(n-1).

A342346

a(1) = 4, a(n) = smallest palindromic nontrivial multiple of a(n-1) containing all decimal digits of a(n-1).

Terms

    a(0) =4a(1) =44a(2) =484a(3) =48884a(4) =8408048a(5) =84088888048

External references