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 A068335 #16 May 09 2025 07:13:46
%S A068335 11,13,17,49,82,85,86,87,91,93,94,95,106,111,115,118,119,122,123,125,
%T A068335 129,133,134,141,142,143,145,146,155,158,159,161,747,764,772,775,788,
%U A068335 796,801,833,844,845,847,867,873,892,908,909,916,925,927,931,932,956
%N A068335 Numbers k such that 3^tau(k) <= k < 2*3^tau(k).
%H A068335 Amiram Eldar, <a href="/A068335/b068335.txt">Table of n, a(n) for n = 1..10000</a>
%t A068335 q[k_] := Module[{m = 3^DivisorSigma[0, k]}, m <= k < 2*m]; Select[Range[1000], q] (* _Amiram Eldar_, May 09 2025 *)
%o A068335 (PARI) isok(k) = {my(m = 3^numdiv(k)); m <= k && k < 2*m;} \\ _Amiram Eldar_, May 09 2025
%Y A068335 Cf. A000005 (tau), A068332.
%K A068335 easy,nonn
%O A068335 1,1
%A A068335 _Benoit Cloitre_, Mar 25 2002
%E A068335 Name corrected by _Sean A. Irvine_, Feb 10 2024