Numbers k such that 2*10^k - 27 is prime.

Terms

a(0) =2a(1) =3a(2) =4a(3) =9a(4) =26a(5) =40a(6) =41a(7) =56a(8) =82a(9) =114a(10) =150a(11) =155a(12) =203a(13) =213a(14) =578a(15) =2638a(16) =4761a(17) =10202a(18) =14211a(19) =16421a(20) =18047a(21) =30701a(22) =53834a(23) =66826a(24) =115784a(25) =141407