Numbers k such that k^7 + 7*k + 7^k is prime.
A220703
Numbers k such that k^7 + 7*k + 7^k is prime.
Terms
- a(0) =2a(1) =3a(2) =17a(3) =74a(4) =120a(5) =212a(6) =528a(7) =2348a(8) =13820a(9) =41268
External references
- oeis: A220703
A220703
Numbers k such that k^7 + 7*k + 7^k is prime.