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 A003393 #19 Aug 04 2020 15:33:03 %S A003393 4,515,1026,1537,2048,19686,20197,20708,21219,39368,39879,40390,59050, %T A003393 59561,78732,262147,262658,263169,263680,281829,282340,282851,301511, %U A003393 302022,321193,524290,524801,525312,543972,544483,563654,786433,786944,806115,1048576,1953128,1953639 %N A003393 Numbers that are the sum of 4 positive 9th powers. %C A003393 As the order of addition doesn't matter we can assume terms are in nondecreasing order. - _David A. Corneth_, Aug 01 2020 %H A003393 David A. Corneth, <a href="/A003393/b003393.txt">Table of n, a(n) for n = 1..10000</a> %e A003393 From _David A. Corneth_, Aug 01 2020: (Start) %e A003393 12964419872 is in the sequence as 12964419872 = 3^9 + 5^9 + 11^9 + 13^9. %e A003393 59116436980 is in the sequence as 59116436980 = 5^9 + 6^9 + 14^9 + 15^9. %e A003393 79254744137 is in the sequence as 79254744137 = 6^9 + 11^9 + 15^9 + 15^9. (End) %Y A003393 A###### (x, y): Numbers that are the form of x nonzero y-th powers. %Y A003393 Cf. A000404 (2, 2), A000408 (3, 2), A000414 (4, 2), A003072 (3, 3), A003325 (3, 2), A003327 (4, 3), A003328 (5, 3), A003329 (6, 3), A003330 (7, 3), A003331 (8, 3), A003332 (9, 3), A003333 (10, 3), A003334 (11, 3), A003335 (12, 3), A003336 (2, 4), A003337 (3, 4), A003338 (4, 4), A003339 (5, 4), A003340 (6, 4), A003341 (7, 4), A003342 (8, 4), A003343 (9, 4), A003344 (10, 4), A003345 (11, 4), A003346 (12, 4), A003347 (2, 5), A003348 (3, 5), A003349 (4, 5), A003350 (5, 5), A003351 (6, 5), A003352 (7, 5), A003353 (8, 5), A003354 (9, 5), A003355 (10, 5), A003356 (11, 5), A003357 (12, 5), A003358 (2, 6), A003359 (3, 6), A003360 (4, 6), A003361 (5, 6), A003362 (6, 6), A003363 (7, 6), A003364 (8, 6), A003365 (9, 6), A003366 (10, 6), A003367 (11, 6), A003368 (12, 6), A003369 (2, 7), A003370 (3, 7), A003371 (4, 7), A003372 (5, 7), A003373 (6, 7), A003374 (7, 7), A003375 (8, 7), A003376 (9, 7), A003377 (10, 7), A003378 (11, 7), A003379 (12, 7), A003380 (2, 8), A003381 (3, 8), A003382 (4, 8), A003383 (5, 8), A003384 (6, 8), A003385 (7, 8), A003387 (9, 8), A003388 (10, 8), A003389 (11, 8), A003390 (12, 8), A003391 (2, 9), A003392 (3, 9), A003393 (4, 9), A003394 (5, 9), A003395 (6, 9), A003396 (7, 9), A003397 (8, 9), A003398 (9, 9), A003399 (10, 9), A004800 (11, 9), A004801 (12, 9), A004802 (2, 10), A004803 (3, 10), A004804 (4, 10), A004805 (5, 10), A004806 (6, 10), A004807 (7, 10), A004808 (8, 10), A004809 (9, 10), A004810 (10, 10), A004811 (11, 10), A004812 (12, 10), A004813 (2, 11), A004814 (3, 11), A004815 (4, 11), A004816 (5, 11), A004817 (6, 11), A004818 (7, 11), A004819 (8, 11), A004820 (9, 11), A004821 (10, 11), A004822 (11, 11), A004823 (12, 11), A047700 (5, 2). %K A003393 nonn,easy %O A003393 1,1 %A A003393 _N. J. A. Sloane_ %E A003393 Removed incorrect program. - _David A. Corneth_, Aug 01 2020