Numbers k such that (79*10^k - 1)/3 is prime.

Terms

a(0) =1a(1) =2a(2) =5a(3) =11a(4) =23a(5) =38a(6) =59a(7) =77a(8) =79a(9) =413a(10) =919a(11) =1079a(12) =1343a(13) =3194a(14) =5168a(15) =6266a(16) =12710a(17) =18711a(18) =47185a(19) =82347a(20) =170901a(21) =180710