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 A325627 #10 Oct 25 2024 07:15:24 %S A325627 2,5,13,89,233,1597,113,28657,514229,2417,2221,59369,433494437, %T A325627 2971215073,55945741,2710260697,555003497,1429913,46165371073, %U A325627 86020717,92180471494753,99194853094755497,1665088321800481,361040209,770857978613,512119709,8242065050061761 %N A325627 a(n) is the largest prime factor in A030426(n). %H A325627 Amiram Eldar, <a href="/A325627/b325627.txt">Table of n, a(n) for n = 1..222</a> %H A325627 C. L. Stewart, <a href="https://doi.org/10.1112/plms/s3-35.3.425">On Divisors of Fermat, Fibonacci, Lucas, and Lehmer Numbers</a>, Proceedings of the London Mathematical Society, Vol. s3-35, No. 3 (1977), pp. 425-447. See p. 430. %F A325627 From _Amiram Eldar_, Oct 25 2024: (Start) %F A325627 a(n) = A006530(A030426(n)). %F A325627 a(n) = A060385(prime(n+1)). %F A325627 a(n) > c * prime(n) * log(prime(n)), where c is an effectively computable positive constant (Stewart, 1977). (End) %t A325627 Table[FactorInteger[Fibonacci [Prime[n]]][[-1, 1]], {n, 2, 30}] %o A325627 (Magma) [Maximum(PrimeDivisors(Fibonacci(NthPrime(n)))): n in [2..35]]; %Y A325627 Cf. A000045, A005478, A006530, A030426, A060385, A325626. %K A325627 nonn %O A325627 1,1 %A A325627 _Vincenzo Librandi_, May 13 2019