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 A214922 #11 Nov 23 2019 02:38:26 %S A214922 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,24,25,26, %T A214922 27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49, %U A214922 50,51,52,53,54 %N A214922 Numbers of the form x^2 + y^2 + z^3 + w^3 (x, y, z, w >= 0). %C A214922 Conjecture: 23 is the only number not in this sequence. %C A214922 Not the same as A004830: 239 is a term of this sequence but not of A004830. - _R. J. Mathar_ and _Joerg Arndt_, Jul 28 2012 %C A214922 There are no other missing numbers from 24 to 10^8. - _Giovanni Resta_, Oct 12 2019 %e A214922 22 = 2^2 + 4^2 + 1^3 + 1^3, 22 is in this sequence. %Y A214922 Cf. A001481, A004999, A022549, A022550, A022551, A022552. %K A214922 nonn %O A214922 1,3 %A A214922 _Philippe Deléham_, Jul 20 2012