Largest prime factor of 10^n + 1.

Terms

a(0) =2a(1) =11a(2) =101a(3) =13a(4) =137a(5) =9091a(6) =9901a(7) =909091a(8) =5882353a(9) =52579a(10) =27961a(11) =8779a(12) =99990001a(13) =1058313049a(14) =121499449a(15) =9091a(16) =69857a(17) =21993833369a(18) =999999000001a(20) =5964848081a(21) =909091a(22) =1056689261