20201001, 20:04  #419 
Dec 2008
you know...around...
609_{10} Posts 

20201001, 22:31  #420 
Jan 2020
2·3^{2}·7 Posts 

20201012, 08:01  #421 
"Ruben"
Oct 2020
Nederland
2×19 Posts 
48
I saw 48 a bit above,
Possible Prime Positions for 7# New number 987654103 
20201012, 09:51  #422 
Jul 2018
Martin, Slovakia
271 Posts 

20201012, 10:53  #423 
"Ruben"
Oct 2020
Nederland
2·19 Posts 
Good
Yes, that's right!

20201012, 11:47  #424 
"Ruben"
Oct 2020
Nederland
2×19 Posts 
oops
I forgot to post the next number :
30 031 
20201013, 01:33  #425  
Feb 2017
Nowhere
2^{2}·3·5^{2}·13 Posts 
Quote:
Of course, the dayofmonth 13 is prime. But I wondered if there was a way to associate either complete date, October 13 or 14, 2020, with a prime number. And lo and behold, the Julian Date of October 13, 2020 is 20287. And 20287 is a prime number. 

20201013, 12:41  #427  
Feb 2017
Nowhere
2^{2}·3·5^{2}·13 Posts 
Quote:
The Julian Day (number) is the number of days (including fractional part) since the beginning of the "Julian period" which is (12:00) January 1, 4713 BC, somewhat over 6000 years ago. The number of days in 6000 years is a bit larger than 6000x360 = 2160000. The Julian Day Number for (00:00) October 13, 2020 is 2459135.5 (nearest primes 2459129 and 245941). There is also a "Modified Julian Day Number," which subtracts 2,400,000.5 from the Julian Day Number, shifting the starting date to November 17, 1858 and the start time from Noon to Midnight. The Modified Julian Day Number for (00:00) October 13, 2020 is 59135 (nearest primes 59123 and 59141). 

20201013, 12:44  #428 
"Ruben"
Oct 2020
Nederland
2·19 Posts 
I thought this thread was about finding particularities in the posted number and post a number...

20201013, 13:09  #429 
Undefined
"The unspeakable one"
Jun 2006
My evil lair
2^{3}×11×67 Posts 

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