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A082998
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a(n) = card{ x <= n : omega(x) = 3 }.
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0
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 10
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,42
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REFERENCES
| G. Tenenbaum, Introduction a la theorie analytique et probabiliste des nombres, p. 203, Publications de l'Institut Cartan,1990.
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FORMULA
| a(n) ~ (1/2)*(n/log(n))*log(log(n))^2
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PROG
| (PARI) a(n)=sum(i=1, n, if(omega(i)-3, 0, 1))
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CROSSREFS
| Cf. A025528, A072000.
Sequence in context: A062153 A204560 A135661 * A076620 A121900 A056811
Adjacent sequences: A082995 A082996 A082997 * A082999 A083000 A083001
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KEYWORD
| nonn
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AUTHOR
| Benoit Cloitre (benoit7848c(AT)orange.fr), May 30 2003
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