Numbers k such that 10^(2*k+1) - 10^k - 1 is prime.
A183187
Numbers k such that 10^(2*k+1) - 10^k - 1 is prime.
Terms
- a(0) =26a(1) =378a(2) =1246a(3) =1798a(4) =2917a(5) =23034a(6) =47509a(7) =52140a(8) =67404a(9) =944264
External references
- oeis: A183187