Smallest prime factor of 10^n + 1.

Terms

a(0) =2a(1) =11a(2) =101a(3) =7a(4) =73a(5) =11a(6) =101a(7) =11a(8) =17a(9) =7a(10) =101a(11) =11a(12) =73a(13) =11a(14) =29a(15) =7a(16) =353a(17) =11a(18) =101a(19) =11a(20) =73a(21) =7a(22) =89a(23) =11a(24) =17a(25) =11a(26) =101a(27) =7a(28) =73a(29) =11