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Bill Allombert on Thu, 01 Feb 2024 21:14:46 +0100
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Re: primepi([from,until])
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- To: pari-users@pari.math.u-bordeaux.fr
- Subject: Re: primepi([from,until])
- From: Bill Allombert <Bill.Allombert@math.u-bordeaux.fr>
- Date: Thu, 1 Feb 2024 21:14:42 +0100
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On Thu, Feb 01, 2024 at 09:08:00PM +0100, Ruud H.G. van Tol wrote:
>
> I'm adding
>
> a(n) = #primes([n^2/4, (n+1)^2/4]);
>
> to https://oeis.org/A220492
>
> and was wondering if primepi() should grow a primepi([x1, x2])variant,
> to return the number of primes p, x1 <= p <= x2.
just do primepi(floor(x2))- primepi(ceil(x1)-1) or something ?
PS: I have vague plans to rewrite primepi to be faster....
Cheers,
Bill