de Bruijn, N. G. On the number of uncancelled elements in the sieve of Eratosthenes. (English) Zbl 0037.03001 Proc. Akad. Wet. Amsterdam 53, 803-812 (1950); Indag. Math. 12, 247-256 (1950). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 27 Documents Keywords:Number theory PDFBibTeX XMLCite \textit{N. G. de Bruijn}, Proc. Akad. Wet. Amsterdam 53, 803--812 (1950; Zbl 0037.03001) Online Encyclopedia of Integer Sequences: a(k) = k! * lim_{n->oo} card({ i*j; i=1..k, j=1..n })/n.