Re: Density of sequence questions

In article
<20147489.59653.1246478535393.JavaMail.jakarta@xxxxxxxxxxxxxxxxxxxxxx>,
"Richard L. Peterson" <rl_pete@xxxxxxxxx> wrote:

I should have asked also:If q is cofinite in P,
does Q have pos. density or at least positive
limsup in N?

I think that one's easy. If q is missing only the primes
p_1, p_2, ..., p_n, then Q is missing only the numbers
not relatively prime to A = (p_1)(p_2)...(p_n), and you
can work out the density of those via the Euler phi-function.

I think the keyphrase for the questions you are asking is
"sieve methods."

--
Gerry Myerson (gerry@xxxxxxxxxxxxxxx) (i -> u for email)
.

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