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 A014156 #12 Jul 08 2025 02:53:24
%S A014156 5,12,13,17,19,20,24,25,26,31,32,34,35,38,39,40,41,43,47,49,50,51,52,
%T A014156 54,57,58,59,60,61,62,68,69,71,73,75,76,77,80,81,83,84,87,88,89,90,94,
%U A014156 95,96,97,98,101,102,103,104,107,108,110,111,112,114,115,116,117,122
%N A014156 Numbers that are not the sum of a nonnegative cube and a triangular number.
%t A014156 Complement[Range[0, 1000], Union[Flatten[Outer[Plus, Table[n^3, {n, 0, 10}], Table[n(n+1)/2, {n, 0, 50}]]]]]
%Y A014156 Cf. A014155 (complement)
%K A014156 nonn
%O A014156 1,1
%A A014156 _N. J. A. Sloane_
%E A014156 Corrected and extended by _Dean Hickerson_, Aug 30 2001