2,1

Coxeter and Moser p. 131 remark that the first term in this sequence is comparable to Eddington's estimate of the number of protons in the universe.

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^120*(q^2-1)*(q^8-1)*(q^12-1)*(q^14-1)*(q^18-1)*(q^20-1)*(q^24-1)*(q^30-1);

Cf. A004231.

Sequence in context: A095538 A095540 A095542 this_sequence A095544 A095546 A095548

Adjacent sequences: A008865 A008866 A008867 this_sequence A008869 A008870 A008871

nonn,easy,nice,bref

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

a(4) added by N. J. A. Sloane (njas(AT)research.att.com), Sep 16 2008