Numbers k such that R(k+6) = 2.

Terms

a(0) =14a(1) =194a(2) =1994a(3) =19994a(4) =199994a(5) =1999994a(6) =19999994a(7) =199999994a(8) =1999999994a(9) =19999999994a(10) =199999999994