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 A003391 #17 Aug 04 2020 15:50:02 %S A003391 2,513,1024,19684,20195,39366,262145,262656,281827,524288,1953126, %T A003391 1953637,1972808,2215269,3906250,10077697,10078208,10097379,10339840, %U A003391 12030821,20155392,40353608,40354119,40373290,40615751,42306732,50431303,80707214,134217729,134218240,134237411 %N A003391 Numbers that are the sum of 2 positive 9th powers. %H A003391 David A. Corneth, <a href="/A003391/b003391.txt">Table of n, a(n) for n = 1..10000</a> %e A003391 From _David A. Corneth_, Aug 03 2020: (Start) %e A003391 4605366718202103 is in the sequence as 4605366718202103 = 8^9 + 55^9. %e A003391 66540479494556160 is in the sequence as 66540479494556160 = 16^9 + 74^9. %e A003391 208226326986883072 is in the sequence as 208226326986883072 = 28^9 + 84^9. (End) %Y A003391 Cf. A003380 (8th), A004802 (10th). %Y A003391 Cf. A001017 (ninth powers). %K A003391 nonn,easy %O A003391 1,1 %A A003391 _N. J. A. Sloane_