a(1) = 9, a(n) = smallest nontrivial palindromic multiple of a(n-1). a(n) is not equal to a(n-1) or a concatenation of a(n-1) with itself.

A083155

a(1) = 9, a(n) = smallest nontrivial palindromic multiple of a(n-1). a(n) is not equal to a(n-1) or a concatenation of a(n-1) with itself.

Terms

    a(0) =9a(1) =171a(2) =1881a(3) =171171a(4) =1882881a(5) =306909603a(6) =11355655311

External references