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 A003392 #18 Aug 04 2020 19:54:21
%S A003392 3,514,1025,1536,19685,20196,20707,39367,39878,59049,262146,262657,
%T A003392 263168,281828,282339,301510,524289,524800,543971,786432,1953127,
%U A003392 1953638,1954149,1972809,1973320,1992491,2215270,2215781,2234952,2477413,3906251,3906762,3925933,4168394,5859375
%N A003392 Numbers that are the sum of 3 positive 9th powers.
%H A003392 Robert Israel, <a href="/A003392/b003392.txt">Table of n, a(n) for n = 1..10000</a>
%e A003392 From _David A. Corneth_, Aug 04 2020: (Start)
%e A003392 391407194198 is in the sequence as 391407194198 = 3^9 + 16^9 + 19^9.
%e A003392 2313193015070 is in the sequence as 2313193015070 = 7^9 + 20^9 + 23^9.
%e A003392 11440294750613 is in the sequence as 11440294750613 = 1^9 + 25^9 + 27^9. (End)
%p A003392 N:= 10^10: # For all terms <= N
%p A003392 B:= floor(N^(1/9)):
%p A003392 S:=select(t -> t <= N, {seq(seq(seq(i^9+j^9+k^9,k=j..B),j=i..B),i=1..B)}):
%p A003392 sort(convert(S,list)); # _Robert Israel_, Mar 04 2020
%Y A003392 Cf. A001017 (ninth powers).
%K A003392 nonn,easy
%O A003392 1,1
%A A003392 _N. J. A. Sloane_