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 A018117 #14 Jul 08 2025 06:26:49 %S A018117 1,1,1,1,1,2,2,2,3,3,4,4,5,6,6,8,9,10,12,13,16,18,21,24,27,32,36,42, %T A018117 48,55,64,73,84,97,111,128,147,168,194,222,256,294,337,388,445,512, %U A018117 588,675,776,891,1024,1176,1351,1552,1782,2048,2352,2702,3104,3565,4096 %N A018117 Powers of fifth root of 2 rounded down. %H A018117 Amiram Eldar, <a href="/A018117/b018117.txt">Table of n, a(n) for n = 0..1000</a> %t A018117 a[n_] := Floor[2^(n/5)]; Array[a, 100, 0] (* _Amiram Eldar_, Apr 04 2025 *) %o A018117 (PARI) a(n) = sqrtnint(2^n, 5) \\ _Amiram Eldar_, Apr 04 2025 %Y A018117 Cf. A017910, A017979, A018048. %K A018117 nonn,easy %O A018117 0,6 %A A018117 _N. J. A. Sloane_