Numbers k such that (55*10^k + 89)/9 is prime.

Terms

a(0) =1a(1) =3a(2) =4a(3) =7a(4) =10a(5) =31a(6) =39a(7) =70a(8) =84a(9) =135a(10) =154a(11) =279a(12) =282a(13) =522a(14) =660a(15) =765a(16) =1153a(17) =1980a(18) =5670a(19) =8064a(20) =20823a(21) =34290a(22) =79711a(23) =109759