This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A121171 #6 May 26 2022 09:50:36
%S A121171 11,41,31,2161,151,2521,911,3041,541,570601,39161,20641,24571,
%T A121171 12317523121,18451,23725145626561,12760031,10783342081,87382901,
%U A121171 5738108801,767131,59996854928656801,686551,23735900452321,28143378001,42426476041450801,119611
%N A121171 Largest prime divisor of Lucas(5*n), where Lucas(k) = A000032(k).
%C A121171 Final digit of a(n) is 1. Mod[a(n),10] = 1. Final digit of many prime divisors of Lucas(5*n) is 1.
%H A121171 Daniel Suteu, <a href="/A121171/b121171.txt">Table of n, a(n) for n = 1..309</a>
%F A121171 a(n) = A006530(A000032(5*n)) = A079451(5*n). - _Daniel Suteu_, May 26 2022
%t A121171 Table[Max[Flatten[FactorInteger[Fibonacci[5n-1]+Fibonacci[5n+1]]]],{n,1,40}]
%o A121171 (PARI)
%o A121171 lucas(n) = fibonacci(n+1)+fibonacci(n-1); \\ A000032
%o A121171 a(n) = vecmax(factor(lucas(5*n))[,1]); \\ _Daniel Suteu_, May 26 2022
%Y A121171 Cf. A000032, A000045, A079451.
%K A121171 nonn
%O A121171 1,1
%A A121171 _Alexander Adamchuk_, Aug 14 2006