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 A093817 #22 Sep 12 2022 05:59:22
%S A093817 1,5,13,29,61,5,23,509,1021,409,4093,431,16381,6553,71,2473,23831,97,
%T A093817 1048573,2713,4194301,1677721,16777213,70051,5197,31033,1877171,
%U A093817 536870909,46684427,22605091,464773,296204641,3360037,6871947673,283007
%N A093817 Largest prime factor of 2^n-3.
%H A093817 Amiram Eldar, <a href="/A093817/b093817.txt">Table of n, a(n) for n = 2..626</a> (terms 2..200 from Vincenzo Librandi)
%F A093817 a(n) = A006530(A036563(n)). - _Amiram Eldar_, Sep 12 2022
%t A093817 PrimeFactors[n_] := Flatten[ Table[ # [[1]], {1}] & /@ FactorInteger[n]]; Table[ PrimeFactors[2^n - 3][[ -1]], {n, 2, 46}] (* _Robert G. Wilson v_, May 24 2004 *)
%t A093817 Table[FactorInteger[2^n-3][[-1,1]],{n,2,40}] (* _Harvey P. Dale_, Feb 01 2015 *)
%Y A093817 Cf. A006530, A036563, A050414, A050415, A093810.
%K A093817 nonn
%O A093817 2,2
%A A093817 _Yasutoshi Kohmoto_, May 11 2004
%E A093817 More terms from _Robert G. Wilson v_, May 24 2004