Integers k such that R(k+7) = 3.

Terms

a(0) =23a(1) =293a(2) =2993a(3) =29993a(4) =299993a(5) =2999993a(6) =29999993a(7) =299999993a(8) =2999999993a(9) =29999999993a(10) =299999999993