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 2021-03-04, 02:48 #1 MattcAnderson     "Matthew Anderson" Dec 2010 Oregon, USA 2×3×7×17 Posts Whats a p7? it is a seven digit prime number for example 4002499 another is 828611 Cheers Matt
 2021-03-04, 03:11 #2 Uncwilly 6809 > 6502     """"""""""""""""""" Aug 2003 101×103 Posts 224068 Posts Context makes a difference: Automotive: https://www.thedrive.com/new-cars/36...n-new-york-ipo Airplane: https://en.wikipedia.org/wiki/Lockheed_P-7 CPUs: https://en.wikipedia.org/wiki/List_o...res#:~:text=P7
2021-03-04, 03:14   #3
CRGreathouse

Aug 2006

32·5·7·19 Posts

Quote:
 Originally Posted by MattcAnderson it is a seven digit prime number for example 4002499 another is 828611
There are $\pi(10^7) - \pi(10^6) = 586,081$ in total.

 2021-03-04, 03:21 #4 retina Undefined     "The unspeakable one" Jun 2006 My evil lair 611510 Posts P7: proper prior planning prevents piss poor performance Thanks go to WP for that one. And unsurprisingly it doesn't list the subject of this thread.
2021-03-04, 06:58   #5
Batalov

"Serge"
Mar 2008
Phi(4,2^7658614+1)/2

22·2,347 Posts

Quote:
 Originally Posted by MattcAnderson another is 828611
Ah, found your problem. Counting is hard!

 2021-03-04, 06:59 #6 MattcAnderson     "Matthew Anderson" Dec 2010 Oregon, USA 2CA16 Posts Hi all, Thank you specifically for the last 3 replies. They really put a smile on my face. Cheers Matt
 2021-03-04, 09:45 #7 retina Undefined     "The unspeakable one" Jun 2006 My evil lair 5·1,223 Posts A small and easy little quiz for MattcAnderson. Is there always a prime Pn for every n>0?
2021-03-04, 18:03   #8
R. Gerbicz

"Robert Gerbicz"
Oct 2005
Hungary

2×727 Posts

Quote:
 Originally Posted by MattcAnderson it is a seven digit prime number for example 4002499 another is 828611
Destroyed?
Code:
rate=0.1;year=21;(1+rate)^year
rate=0.03;year=3;(1-(1+rate)^(-year))/rate

%1 = 7.4002499442581601012110000000000000000
%2 = 2.8286113548946809221333416306177114687
look the fractional part(!)

(for the 2nd formula we also have a financial tale)

Big coincidence?

2021-03-05, 22:13   #9
ZFR

Feb 2008
Bray, Ireland

100011112 Posts

Quote:
 Originally Posted by Batalov Ah, found your problem. Counting is hard!
There are 3 types of people: those who can count and those who can't.

2021-03-05, 22:27   #10
Uncwilly
6809 > 6502

"""""""""""""""""""
Aug 2003
101×103 Posts

2×7×677 Posts

Quote:
 Originally Posted by ZFR There are 3 types of people: those who can count and those who can't.
There are 10 types of people:
Those that can infer from incomplete data,

2021-03-05, 23:33   #11
kriesel

"TF79LL86GIMPS96gpu17"
Mar 2017
US midwest

23·3·11·19 Posts

Quote:
 Originally Posted by MattcAnderson it is a seven digit prime number ... another is 828611
828611 = 7 × 118373 = 7 x p6 = c6
2828611 and 3828611 are p7's.

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