
LINKS

Table of n, a(n) for n=1..5.
Paul ErdÅ‘s, Carole B. Lacampagne, Carl Pomerance, J. L. Selfridge, On the Schnirelmann and asymptotic densities of sets of nonmultiples, Proceedings of the sixteenth Southeastern international conference on combinatorics, graph theory and computing (Boca Raton, Fla., 1985). Congr. Numer. 48 (1985), 6779. MR0830700 (87j:11013).
