OFFSET
0,3
REFERENCES
C. J. Moreno and S. S. Wagstaff, Jr., Sums of Squares of Integers, Chapman and Hall, 2006, p. 253.
J. Tits, Symmetrie, in Miscellanea mathematica, Springer, Berlin, 1991, pp. 293-304 (see p. 298).
LINKS
Jacques Tits and John Stillwell, Symmetry, Amer. Math. Monthly 107 (2000), 454-461.
CROSSREFS
KEYWORD
dead
STATUS
approved