0,3

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).

J. Tits, Symmetry, Amer. Math. Monthly 107 (2000), 454-461.

Sequence in context: A067596 A114098 A034141 this_sequence A114097 A083847 A034142

Adjacent sequences: A054999 A055000 A055001 this_sequence A055003 A055004 A055005

dead