a(1) = 3, 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.

A083149

a(1) = 3, 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) =3a(1) =6a(2) =222a(3) =444a(4) =888a(5) =21312a(6) =42624a(7) =468864a(8) =40322304a(9) =80644608a(10) =802494494208

External references