a(1) = 7, a(n) = smallest palindromic nontrivial multiple of a(n-1) containing all decimal digits of a(n-1).

A342347

a(1) = 7, a(n) = smallest palindromic nontrivial multiple of a(n-1) containing all decimal digits of a(n-1).

Terms

    a(0) =7a(1) =77a(2) =1771a(3) =178871a(4) =1788888871

External references