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 A067905 #19 Feb 16 2025 08:32:45
%S A067905 2,3,5,7,13,17,23,31,55933,176777,23517191,986549121979,
%T A067905 17400648639910404101,2314855893053257675837,
%U A067905 230183094544225348379651767,1275923270962002367060689449590920800609
%N A067905 Primes of the form floor((4/3)^k).
%H A067905 Charles R Greathouse IV, <a href="/A067905/b067905.txt">Table of n, a(n) for n = 1..32</a>
%H A067905 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PowerFloors.html">Power Floors</a>
%t A067905 f[n_]:=Floor[(4/3)^n]; lst={};Do[p=f[n];If[PrimeQ[p],AppendTo[lst,p]],{n,0,6!}];lst (* _Vladimir Joseph Stephan Orlovsky_, Jul 02 2009 *)
%t A067905 Select[Floor[(4/3)^Range[330]],PrimeQ] (* _Harvey P. Dale_, Dec 12 2018 *)
%o A067905 (PARI) v=[]; for(k=2,8004, if(ispseudoprime(t=floor((4/3)^k)), v=concat(v,t))); v
%K A067905 nonn
%O A067905 1,1
%A A067905 _Benoit Cloitre_, Mar 03 2002