Numbers k such that (10^k - 7^k)/3 is prime.
A273403
Numbers k such that (10^k - 7^k)/3 is prime.
Terms
- a(0) =2a(1) =31a(2) =103a(3) =617a(4) =10253a(5) =10691a(6) =35353a(7) =129587a(8) =556441
External references
- oeis: A273403
A273403
Numbers k such that (10^k - 7^k)/3 is prime.