Numbers k such that (7^k - 3^k)/4 is prime.
A128024
Numbers k such that (7^k - 3^k)/4 is prime.
Terms
- a(0) =3a(1) =7a(2) =19a(3) =109a(4) =131a(5) =607a(6) =863a(7) =2917a(8) =5923a(9) =12421a(10) =187507a(11) =353501a(12) =817519
External references
- oeis: A128024