Second-largest prime factor of the n-th Fibonacci number, if composite, or 1 otherwise.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =1a(5) =3a(6) =2a(7) =5a(8) =1a(9) =3a(10) =1a(11) =13a(12) =5a(13) =7a(14) =1a(15) =17a(16) =37a(17) =11a(18) =13a(19) =89a(20) =1a(21) =7a(22) =5a(23) =233a(24) =53a(25) =29a(26) =1a(27) =31a(28) =557a(29) =47