Numbers k such that (10^(2k) + 2*(10^k) + 4)/4 is prime.
A297421
Numbers k such that (10^(2k) + 2*(10^k) + 4)/4 is prime.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =15a(4) =175a(5) =449a(6) =16563
External references
- oeis: A297421
A297421
Numbers k such that (10^(2k) + 2*(10^k) + 4)/4 is prime.