0,5

Ryskov, S. S., C-types of n-dimensional parallelohedra, Dokl. Akad. Nauk SSSR 212 (1973), 46-49.

Ryskov, S. S. and Baranovskii, E. P., C-types of n-dimensional lattices and 5-dimensional primitive parallelohedra (with application to the theory of coverings), Trudy Mat. Inst. Steklov 137 (1976). English translation: Proc. Steklov Inst. Math. 1978, no. 4, 140 pp.

Cf. A071880, A071881, A071882.

Sequence in context: A136328 A003690 A034940 this_sequence A037110 A042267 A141103

Adjacent sequences: A089298 A089299 A089300 this_sequence A089302 A089303 A089304

nonn,hard,nice

N. J. A. Sloane (njas(AT)research.att.com), following a suggestion of J. H. Conway, Dec 26, 2003