Numbers n such that 2*10^n-3 is prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =13a(5) =14a(6) =76a(7) =237a(8) =872a(9) =988a(10) =1280a(11) =1370a(12) =2686a(13) =3612a(14) =4051a(15) =4645a(16) =9162a(17) =10856a(18) =25959a(19) =64882a(20) =144220a(21) =153746a(22) =185930