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 A067904 #17 Jan 11 2015 18:04:27
%S A067904 2,3,5,7,11,17,4987,7481,180693856682317883,4630985912862061063,
%T A067904 75677449184722757264165738713,1910944005427272291238064043761449,
%U A067904 366425537175409658704814112327931286021
%N A067904 Primes of the form floor((3/2)^k).
%D A067904 R. K. Guy, Unsolved Problems in Number Theory, E19.
%H A067904 Charles R Greathouse IV, <a href="/A067904/b067904.txt">Table of n, a(n) for n = 1..23</a>
%t A067904 f[n_]:=Floor[(3/2)^n]; lst={};Do[p=f[n];If[PrimeQ[p],AppendTo[lst,p]],{n,0,4*5!}];lst (* _Vladimir Joseph Stephan Orlovsky_, Jul 02 2009 *)
%t A067904 Select[Floor[(3/2)^Range[300]],PrimeQ] (* _Harvey P. Dale_, Dec 28 2014 *)
%o A067904 (PARI) v=[];for(k=2,5700, if(ispseudoprime(t=floor((3/2)^k)), v=concat(v,t))); v \\ _Charles R Greathouse IV_, Feb 15 2011
%Y A067904 Cf. A043037, A070758, A070759.
%K A067904 nonn
%O A067904 1,1
%A A067904 _Benoit Cloitre_, Mar 03 2002