Numbers k such that (49*10^k + 311)/9 is prime.

Terms

a(0) =1a(1) =3a(2) =6a(3) =7a(4) =9a(5) =10a(6) =12a(7) =24a(8) =39a(9) =135a(10) =258a(11) =382a(12) =660a(13) =900a(14) =1306a(15) =1528a(16) =3658a(17) =3937a(18) =5157a(19) =7006a(20) =7936a(21) =10956a(22) =15396a(23) =45808a(24) =198403