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D. H. Greene and D. E. Knuth, Mathematics for the Analysis of Algorithms; see pp. 95-98.
Table of n, a(n) for n=1..65.
Beeler, M., Gosper, R. W. and Schroeppel, R., HAKMEM, ITEM 29
Cf. A006530, A063762. Complement of A063539. Supersequence of A001358 (semiprimes).
Sequence in context: A131511 A210490 A166155 * A167207 A037143 A236105
Adjacent sequences: A063535 A063536 A063537 * A063539 A063540 A063541
N. J. A. Sloane, Aug 14 2001