2020 gone for good. Welcome 2021! - Printable Version +- HP Forums (https://www.hpmuseum.org/forum) +-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html) +--- Forum: General Forum (/forum-4.html) +--- Thread: 2020 gone for good. Welcome 2021! (/thread-16103.html) |
2020 gone for good. Welcome 2021! - Gerson W. Barbosa - 01-01-2021 03:17 AM RE: 2020 gone for good. Welcome 2021! - Dave Britten - 01-01-2021 04:39 AM 20201231 and 20210101 are both prime numbers. Maybe it's a good sign... RE: 2020 gone for good. Welcome 2021! - rprosperi - 01-01-2021 04:57 AM Awesome job Gerson, I LOVE seeing the New Year greeted by an HP-75C!! And something about the fact that both of those number are Prime, and even more so that Dave thought to check their primeness, bodes well for a better year. Happy New Year everybody! RE: 2020 gone for good. Welcome 2021! - Gamo - 01-01-2021 05:40 AM Happy New Year 2021 [attachment=8975] Gamo RE: 2020 gone for good. Welcome 2021! - Massimo Gnerucci - 01-01-2021 08:49 AM Something terribly wrong must've happened here! [attachment=8976] Happy (new) year! RE: 2020 gone for good. Welcome 2021! - DA74254 - 01-01-2021 09:49 AM Happy New Year. Welcome 2021. RE: 2020 gone for good. Welcome 2021! - Sylvain Cote - 01-01-2021 12:08 PM Happy New Year! RE: 2020 gone for good. Welcome 2021! - MNH - 01-01-2021 05:12 PM Happy New Year 2021! [attachment=8977] RE: 2020 gone for good. Welcome 2021! - Valentin Albillo - 01-01-2021 06:38 PM (01-01-2021 04:39 AM)Dave Britten Wrote: 20201231 and 20210101 are both prime numbers. Maybe it's a good sign... Indeed they are. As for 2021, it's composite and readily factorized a la Fermat, like this: 2021 = 2025 - 4 = 452 - 22 = (45 - 2) * (45 + 2) = 43 * 47. Happy New Year 2021 ! V. RE: 2020 gone for good. Welcome 2021! - Nihotte(lma) - 01-01-2021 07:04 PM Happy New Year 2021 ! Laurent RE: 2020 gone for good. Welcome 2021! - twoweims - 01-02-2021 01:28 AM (01-01-2021 04:39 AM)Dave Britten Wrote: 20201231 and 20210101 are both prime numbers. Maybe it's a good sign... This will not be true next year... I wonder how often this happens and when will be the next time? RE: 2020 gone for good. Welcome 2021! - Jlouis - 01-02-2021 01:31 AM Happy NEW YEAR !!! Stay safe, protect the ones you love and the ones you don't love too! Love all! P.S.: I have a feeling that I made a mistake in the picture above, but I cannot find which.....never mind.... RE: 2020 gone for good. Welcome 2021! - twoweims - 01-02-2021 02:46 AM (01-02-2021 01:28 AM)twoweims Wrote:(01-01-2021 04:39 AM)Dave Britten Wrote: 20201231 and 20210101 are both prime numbers. Maybe it's a good sign... My HP-71 says it happens at the end of these years: Code:
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