Largest prime factor of 11^n+1 (A034524).

Terms

a(0) =2a(1) =3a(2) =61a(3) =37a(4) =7321a(5) =13421a(6) =1117a(7) =1623931a(8) =6304673a(9) =590077a(10) =212601841a(11) =58367a(12) =20113a(13) =59583967a(14) =55527473a(15) =7537711a(16) =447600088289a(17) =2218331a(19) =1390636259