Numbers k such that (56*10^k + 691)/9 is prime.

Terms

a(0) =0a(1) =1a(2) =3a(3) =4a(4) =6a(5) =9a(6) =15a(7) =18a(8) =36a(9) =267a(10) =294a(11) =306a(12) =321a(13) =397a(14) =828a(15) =1501a(16) =1723a(17) =1905a(18) =5047a(19) =8413a(20) =10273a(21) =13519a(22) =35569a(23) =102255a(24) =125385a(25) =127752a(26) =169311