Largest prime dividing the n-th Lucas number (A000032); 1 when no such prime exists.

Terms

a(0) =2a(1) =1a(2) =3a(3) =2a(4) =7a(5) =11a(6) =3a(7) =29a(8) =47a(9) =19a(10) =41a(11) =199a(12) =23a(13) =521a(14) =281a(15) =31a(16) =2207a(17) =3571a(18) =107a(19) =9349a(20) =2161a(21) =211a(22) =307a(23) =461a(24) =1103a(25) =151a(26) =90481a(27) =5779a(28) =14503a(29) =19489