OFFSET
1,3
COMMENTS
LINKS
R. J. Nowakowski, Generalizations of the Langford-Skolem problem, M.S. Thesis, Dept. Math., Univ. Calgary, May 1975. [Scanned copy, with permission.]
Ana Rechtman, Août 2018, 3e défi, Images des Mathématiques, CNRS, 2018 (in French).
CROSSREFS
KEYWORD
nonn,more,changed
AUTHOR
N. J. A. Sloane, Apr 09 2017
STATUS
approved