a(n) = k where R(k+4) = 2.

A086940

a(n) = k where R(k+4) = 2.

Terms

    a(0) =16a(1) =196a(2) =1996a(3) =19996a(4) =199996a(5) =1999996a(6) =19999996a(7) =199999996a(8) =1999999996a(9) =19999999996a(10) =199999999996

External references