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

Terms

a(0) =0a(1) =1a(2) =3a(3) =7a(4) =10a(5) =40a(6) =419a(7) =449a(8) =1737a(9) =2245a(10) =3131a(11) =3813a(12) =5345a(13) =5659a(14) =5681a(15) =8410a(16) =9097a(17) =11293a(18) =21061