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 A048372 #18 Feb 16 2025 08:32:40
%S A048372 3,26,83,173,1983,2953,19753,90643,258999,426859,4255753,13955253,
%T A048372 42111153,92356426,425851173,878398753,9197190176,9196397753,
%U A048372 89494606688,390974932563,918856391641,4250703842293
%N A048372 a(n)^3 is smallest cube containing exactly n 7's.
%H A048372 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/CubicNumber.html">Cubic Number</a>
%t A048372 a[n_] := Module[{i = 0}, While[DigitCount[i^3][[7]] != n, i++ ]; i]; (* Sam Handler (sam_5_5_5_0(AT)yahoo.com), Aug 27 2006 *)
%Y A048372 Cf. A036534, A048365, A048366, A048367, A048368, A048369, A048370, A048371, A048373, A048374.
%K A048372 nonn,base,more
%O A048372 1,1
%A A048372 _Patrick De Geest_, Mar 15 1999
%E A048372 a(14) from Sam Handler (sam_5_5_5_0(AT)yahoo.com), Aug 27 2006
%E A048372 a(15)-a(20) from _Lars Blomberg_, Jun 12 2011
%E A048372 a(21)-a(22) from _Giovanni Resta_, Jun 29 2018