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| Started by | Bonita Montero <Bonita.Montero@gmail.com> |
|---|---|
| First post | 2019-05-15 11:27 +0200 |
| Last post | 2019-05-15 23:23 +0100 |
| Articles | 3 — 3 participants |
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Where can I find maximum primes < 2^n Bonita Montero <Bonita.Montero@gmail.com> - 2019-05-15 11:27 +0200
Re: Where can I find maximum primes < 2^n David Brown <david.brown@hesbynett.no> - 2019-05-15 14:03 +0200
Re: Where can I find maximum primes < 2^n Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-05-15 23:23 +0100
| From | Bonita Montero <Bonita.Montero@gmail.com> |
|---|---|
| Date | 2019-05-15 11:27 +0200 |
| Subject | Where can I find maximum primes < 2^n |
| Message-ID | <qbgm2j$h9$1@news.albasani.net> |
I need the largest prime that fits in a unsigned 64 bit integeger to build hash-keys. Can anyone tell me a source for such primes in the net?
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| From | David Brown <david.brown@hesbynett.no> |
|---|---|
| Date | 2019-05-15 14:03 +0200 |
| Message-ID | <qbgv6f$uft$1@dont-email.me> |
| In reply to | #9916 |
On 15/05/2019 11:27, Bonita Montero wrote: > I need the largest prime that fits in a unsigned 64 bit integeger > to build hash-keys. Can anyone tell me a source for such primes > in the net? 10 seconds of googling gives: <https://primes.utm.edu/lists/2small/0bit.html>
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| From | Ben Bacarisse <ben.usenet@bsb.me.uk> |
|---|---|
| Date | 2019-05-15 23:23 +0100 |
| Message-ID | <87y337jr0r.fsf@bsb.me.uk> |
| In reply to | #9916 |
Bonita Montero <Bonita.Montero@gmail.com> writes: > I need the largest prime that fits in a unsigned 64 bit integeger > to build hash-keys. Can anyone tell me a source for such primes > in the net? That's been answered, but there are also many programs that can tell you. For example, it's common for computer maths programs to have next and previous prime functions. For example, GP/PARI reports ? precprime(2^64 - 1) %1 = 18446744073709551557 as does Maxima. -- Ben.
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