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

Terms

a(0) =1a(1) =2a(2) =3a(3) =17a(4) =140a(5) =990a(6) =1887a(7) =3530a(8) =5996a(9) =13820a(10) =21873a(11) =26045a(12) =87720a(13) =232599a(14) =480684a(15) =538640