Numbers k such that 4*10^k - 11 is prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =15a(6) =35a(7) =61a(8) =256a(9) =357a(10) =628a(11) =767a(12) =1064a(13) =1096a(14) =6608a(15) =14821a(16) =15341a(17) =18795a(18) =22648a(19) =24199a(20) =31919a(21) =38519a(22) =44279