OFFSET
1,1
COMMENTS
Numbers of the form 4*A017101(k) are terms of this sequence.
m is a term iff 16m is also.
LINKS
W. Jagy and I. Kaplansky, Sums of Squares, Cubes and Higher Powers, Experimental Mathematics, vol. 4 (1995) pp. 169-173.
MATHEMATICA
n=239;
t=Union@Flatten@Table[x^2+y^2+z^4, {x, 0, n^(1/2)}, {y, x, (n-x^2)^(1/2)}, {z, 0, (n-x^2-y^2)^(1/4)}];
Complement[Range[0, n], t]
CROSSREFS
KEYWORD
nonn
AUTHOR
XU Pingya, Jun 20 2018
STATUS
approved