OFFSET
2,1
REFERENCES
Zenkin, A. A. Waring's problem: g(1,4)=21 for fourth powers of positive integers. Comput. Math. Appl. 17 (1989), no. 11, 1503--1506. MR0999255 (90k:11127).
CROSSREFS
KEYWORD
nonn,bref,more
AUTHOR
N. J. A. Sloane, Apr 23 2015
STATUS
approved