a(n) is the greatest prime divisor of 10^(2*n)+10^n+1.
A190839
a(n) is the greatest prime divisor of 10^(2*n)+10^n+1.
Terms
- a(0) =37a(1) =37a(2) =333667a(3) =9901a(4) =2906161a(5) =333667a(6) =10838689a(7) =99990001a(9) =2906161a(11) =999999000001a(13) =10838689a(19) =39526741
External references
- oeis: A190839