Numbers k such that 4*10^k-3 is prime.

Terms

a(0) =1a(1) =2a(2) =14a(3) =20a(4) =30a(5) =44a(6) =66a(7) =260a(8) =872a(9) =8846a(10) =26744a(11) =57506a(12) =98472a(13) =106892