2,1

J. H. Conway, R. T. Curtis, S. P. Norton, R. A. Parker and R. A. Wilson, ATLAS of Finite Groups. Oxford Univ. Press, 1985, p. xvi.

H. S. M. Coxeter and W. O. J. Moser, Generators and Relations for Discrete Groups, 4th ed., Springer-Verlag, NY, reprinted 1984, p. 131.

q^63*(q^2-1)*(q^6-1)*(q^8-1)*(q^10-1)*(q^12-1)*(q^14-1)*(q^18-1)/gcd(2, q-1);

Sequence in context: A095470 A095472 A105300 this_sequence A008869 A095474 A003944

Adjacent sequences: A008867 A008868 A008869 this_sequence A008871 A008872 A008873

nonn,easy,bref

N. J. A. Sloane (njas(AT)research.att.com).