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 A018120 #14 Jul 08 2025 06:27:07
%S A018120 1,1,1,1,2,3,3,4,5,7,9,11,13,17,21,27,33,41,52,65,81,100,125,156,195,
%T A018120 243,302,377,469,585,729,908,1131,1409,1755,2187,2724,3393,4227,5266,
%U A018120 6561,8173,10181,12683,15800,19683,24519,30544,38050,47401,59049,73559,91634,114152,142203,177147
%N A018120 Powers of fifth root of 3 rounded down.
%H A018120 Vincenzo Librandi, <a href="/A018120/b018120.txt">Table of n, a(n) for n = 0..2000</a>
%t A018120 Table[Floor[(3^(1/5))^n],{n,0,50}] (* _Vincenzo Librandi_, Jun 12 2025 *)
%o A018120 (Magma) seq := [Floor(3^(n/5)) : n in [0..60]]; seq; // _Vincenzo Librandi_, Jun 12 2025
%Y A018120 Cf. A005532.
%K A018120 nonn
%O A018120 0,5
%A A018120 _N. J. A. Sloane_