Numbers k such that (404*10^k - 53)/9 is prime.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =22a(5) =37a(6) =38a(7) =64a(8) =80a(9) =92a(10) =104a(11) =136a(12) =164a(13) =172a(14) =349a(15) =1492a(16) =2551a(17) =16375a(18) =58087a(19) =59149