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 A138184 #22 Dec 25 2015 00:18:08
%S A138184 2,3,5,7,13,19,31,53,89,139,233,373,607,983,1597,2579,4177,6763,10939,
%T A138184 17707,28657,46351,75017,121379,196387,317797,514229,832003,1346249,
%U A138184 2178283,3524569,5702867,9227443,14930341,24157811,39088157,63245971
%N A138184 Largest prime not exceeding Fibonacci(n) = A000045(n).
%H A138184 Harry J. Smith, <a href="/A138184/b138184.txt">Table of n, a(n) for n = 3..657</a>
%F A138184 a(n) = A000040(A054782(n)). - _R. J. Mathar_, Apr 22 2008
%e A138184 a(8) = 19 because 19 is the largest prime not exceeding 21 = A000045(8).
%p A138184 A138184 := proc(n) prevprime(combinat[fibonacci](n)+1) ; end: seq(A138184(n),n=3..45) ; # _R. J. Mathar_, Apr 22 2008
%t A138184 PrimePrev[n_]:=Module[{k=n},While[ !PrimeQ[k],k-- ];k];f[n_]:=Fibonacci[n];lst={};Do[AppendTo[lst,PrimePrev[f[n]]],{n,5!}];lst (* _Vladimir Joseph Stephan Orlovsky_, Feb 26 2010 *)
%Y A138184 Cf. A138181, A138182, A138183, A138185.
%K A138184 easy,nonn
%O A138184 3,1
%A A138184 _Colm Mulcahy_, Mar 04 2008
%E A138184 Edited and extended by _R. J. Mathar_, Apr 22 2008
%E A138184 Offset changed from 4 to 3 by _Harry J. Smith_, Jan 02 2009