2020 gone for good. Welcome 2021!
01-01-2021, 06:38 PM
Post: #9
 Valentin Albillo Senior Member Posts: 1,100 Joined: Feb 2015
RE: 2020 gone for good. Welcome 2021!
(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.

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 Messages In This Thread 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 RE: 2020 gone for good. Welcome 2021! - Valentin Albillo - 01-01-2021 06:38 PM RE: 2020 gone for good. Welcome 2021! - twoweims - 01-02-2021, 01:28 AM RE: 2020 gone for good. Welcome 2021! - twoweims - 01-02-2021, 02:46 AM RE: 2020 gone for good. Welcome 2021! - rprosperi - 01-01-2021, 04:57 AM RE: 2020 gone for good. Welcome 2021! - Gamo - 01-01-2021, 05:40 AM RE: 2020 gone for good. Welcome 2021! - Massimo Gnerucci - 01-01-2021, 08:49 AM RE: 2020 gone for good. Welcome 2021! - DA74254 - 01-01-2021, 09:49 AM RE: 2020 gone for good. Welcome 2021! - Sylvain Cote - 01-01-2021, 12:08 PM RE: 2020 gone for good. Welcome 2021! - MNH - 01-01-2021, 05:12 PM RE: 2020 gone for good. Welcome 2021! - Nihotte(lma) - 01-01-2021, 07:04 PM RE: 2020 gone for good. Welcome 2021! - Jlouis - 01-02-2021, 01:31 AM

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