Numbers k such that (86*10^k - 311)/9 is prime.

Terms

a(0) =1a(1) =3a(2) =6a(3) =13a(4) =31a(5) =58a(6) =76a(7) =96a(8) =147a(9) =174a(10) =306a(11) =532a(12) =1177a(13) =3019a(14) =5790a(15) =5952a(16) =7489a(17) =10269a(18) =10936a(19) =20209a(20) =28188a(21) =55645a(22) =71068a(23) =89640