Numbers k such that (10^k + 77)/3 is prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =8a(6) =16a(7) =20a(8) =56a(9) =58a(10) =75a(11) =109a(12) =124a(13) =217a(14) =221a(15) =368a(16) =439a(17) =595a(18) =1309a(19) =6986a(20) =11600a(21) =20855a(22) =29327a(23) =34305a(24) =42145a(25) =44056a(26) =52667a(27) =75707a(28) =79067a(29) =81848