Numbers k such that 10^(2*k+1)-7*10^k-1 is prime.
A115073
Numbers k such that 10^(2*k+1)-7*10^k-1 is prime.
Terms
- a(0) =1a(1) =8a(2) =9a(3) =352a(4) =530a(5) =697a(6) =1315a(7) =1918a(8) =2874a(9) =5876a(10) =6768a(11) =62938a(12) =134739
External references
- oeis: A115073