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 A017988 #14 Sep 08 2022 08:44:44
%S A017988 1,1,2,5,8,14,25,42,73,125,213,365,625,1068,1827,3125,5343,9137,15625,
%T A017988 26718,45687,78125,133591,228438,390625,667959,1142194,1953125,
%U A017988 3339796,5710972,9765625,16698983,28554860,48828125,83494919,142774303,244140625
%N A017988 Powers of cube root of 5 rounded down.
%H A017988 Vincenzo Librandi, <a href="/A017988/b017988.txt">Table of n, a(n) for n = 0..200</a>
%t A017988 Table[Floor[5^(n/3)], {n, 0, 40}] (* _Vincenzo Librandi_, Jan 06 2014 *)
%t A017988 Floor[Surd[5,3]^Range[0,40]] (* _Harvey P. Dale_, Jul 05 2022 *)
%o A017988 (Magma) [Floor(5^(n/3)): n in [0..50]]; // _Vincenzo Librandi_, Jan 06 2014
%Y A017988 Cf. powers of cube root of k rounded down: A017979 (k=2), A017982 (k=3), A017985 (k=4), this sequence (k=5), A017991 (k=6), A017994 (k=7), A018000 (k=9), A018003 (k=10), A018006 (k=11), A018009 (k=12), A018012 (k=13), A018015 (k=14), A018018 (k=15), A018021 (k=16), A018024 (k=17), A018027 (k=18), A018030 (k=19), A018033 (k=20), A018036 (k=21), A018039 (k=22), A018042 (k=23), A018045 (k=24).
%K A017988 nonn
%O A017988 0,3
%A A017988 _N. J. A. Sloane_
%E A017988 More terms From _Vincenzo Librandi_, Jan 06 2014