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 A038483 #12 Jul 14 2022 05:49:57
%S A038483 400,2458,2752,2794,2800,16864,17158,17200,17206,19216,19258,19264,
%T A038483 19552,19558,19600,117706,118000,118042,118048,120058,120100,120106,
%U A038483 120394,120400,120442,134464,134506,134512,134800,134806,134848,136858,136864,136906,137200,823600
%N A038483 Sums of 4 distinct powers of 7.
%H A038483 Amiram Eldar, <a href="/A038483/b038483.txt">Table of n, a(n) for n = 1..10000</a>
%t A038483 Sort[Plus @@@ Subsets[7^Range[0, 7], {4}]] (* _Amiram Eldar_, Jul 14 2022 *)
%Y A038483 Base-7 interpretation of A038446.
%Y A038483 Cf. A000420, A038481, A038482.
%K A038483 nonn,easy
%O A038483 1,1
%A A038483 _Olivier Gérard_
%E A038483 Offset corrected by _Amiram Eldar_, Jul 14 2022