01-01-2021, 03:17 AM
01-01-2021, 04:39 AM
20201231 and 20210101 are both prime numbers. Maybe it's a good sign...
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!
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!
01-01-2021, 05:40 AM
Happy New Year 2021
[attachment=8975]
Gamo
[attachment=8975]
Gamo
01-01-2021, 08:49 AM
01-01-2021, 09:49 AM
Happy New Year. Welcome 2021.
01-01-2021, 12:08 PM
Happy New Year!
01-01-2021, 05:12 PM
Happy New Year 2021!
[attachment=8977]
[attachment=8977]
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.
01-01-2021, 07:04 PM
Happy New Year 2021 !
Laurent
Laurent
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?
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....
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...
This will not be true next year...
I wonder how often this happens and when will be the next time?
My HP-71 says it happens at the end of these years:
Code:
4
103
160
190
211
271
304
346
367
376
451
475
502
550
586
649
736
799
817
874
937
1000
1018
1051
1084
1126
1153
1159
1165
1186
1198
1237
1468
1513
1555
1600
1621
1747
1810
1828
1891
1930
1972
1978
1987
2020
2029