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What is 2^77232917 -1?

Posted: February 5th, 2018, 9:49 pm
by Cuchulainn
i.e. what is it?

Re: What is 2^77232917 -1?

Posted: February 6th, 2018, 1:18 am
by Traden4Alpha
It is the number that does not end in a zero for all bases up to 2^77232917-1

Re: What is 2^77232917 -1?

Posted: February 6th, 2018, 3:21 pm
by Cuchulainn
It is the number that does not end in a zero for all bases up to 2^77232917-1
This is [$]M50[$] (Mersenne prime, not the highway). I can compute it but it is 120 km long, I need to find a way to store it. In the meantime, here is [$]M33[$]..Takes a few seconds to compute.

Re: What is 2^77232917 -1?

Posted: February 6th, 2018, 3:43 pm
by Traden4Alpha
It is the number that does not end in a zero for all bases up to 2^77232917-1
This is [$]M50[$] (Mersenne prime, not the highway). I can compute it but it is 120 km long, I need to find a way to store it. In the meantime, here is [$]M33[$]..Takes a few seconds to compute.
[$]M50[$] is easy to store & display! As a 24-bit RGB TIFF image, it would be a square or rectangle of white (RGB[255,255,255]) with a bit more than 3.2 megapixels and cover less than half of a 4k-format monitor. It's almost small enough to fit on my iPhone's screen and definitely fits on my iPad's screen.

Re: What is 2^77232917 -1?

Posted: February 6th, 2018, 3:51 pm
by Cuchulainn
It is the number that does not end in a zero for all bases up to 2^77232917-1
This is [$]M50[$] (Mersenne prime, not the highway). I can compute it but it is 120 km long, I need to find a way to store it. In the meantime, here is [$]M33[$]..Takes a few seconds to compute.
[$]M50[$] is easy to store & display!  As a 24-bit RGB TIFF image, it would be a square or rectangle of white (RGB[255,255,255]) with a bit more than 3.2 megapixels and cover less than half of a 4k-format monitor.  It's almost small enough to fit on my iPhone's screen and definitely fits on my iPad's screen.
TIFF != integer. TIFF can't do algebra.

Re: What is 2^77232917 -1?

Posted: February 6th, 2018, 4:30 pm
by Traden4Alpha
This is [$]M50[$] (Mersenne prime, not the highway). I can compute it but it is 120 km long, I need to find a way to store it. In the meantime, here is [$]M33[$]..Takes a few seconds to compute.
[$]M50[$] is easy to store & display!  As a 24-bit RGB TIFF image, it would be a square or rectangle of white (RGB[255,255,255]) with a bit more than 3.2 megapixels and cover less than half of a 4k-format monitor.  It's almost small enough to fit on my iPhone's screen and definitely fits on my iPad's screen.
TIFF != integer. TIFF can't do algebra.
ASCII string != integer. And unicode is even worse!

Strings on consoles are a horribly inefficient display format -- probably on the order of at least 5 kbits of display memory to show only 3 bits of data.

Re: What is 2^77232917 -1?

Posted: February 6th, 2018, 6:54 pm
by Cuchulainn
It's just for testing. I'll optimise it later ;)
Here is [$]M40[$]

Re: What is 2^77232917 -1?

Posted: February 6th, 2018, 7:03 pm
by Traden4Alpha
M50 is easy.

Just write "1" 77,232,917 times.

Re: What is 2^77232917 -1?

Posted: February 16th, 2018, 2:15 pm
by ExSan

Re: What is 2^77232917 -1?

Posted: February 16th, 2018, 2:37 pm
by Cuchulainn
Esatto.
Non possiamo fisicamente riportarlo in questo articolo, perché è composto da oltre 23milioni di cifre, ma è stato scoperto il più alto numero primo di cui attualmente siamo a conoscenza. Dal momento che questo problema nel trascriverlo è comune a tutti coloro che non possiedono strumenti specialistici, esso è noto più semplicemente come M77232917.

Re: What is 2^77232917 -1?

Posted: February 17th, 2018, 8:18 am
by Collector
\(2^{77232917}-1\neq 10223\times 2^{31172165}+1\)

Re: What is 2^77232917 -1?

Posted: February 18th, 2018, 12:34 am
by ExSan
Esatto.
Non possiamo fisicamente riportarlo in questo articolo, perché è composto da oltre 23milioni di cifre, ma è stato scoperto il più alto numero primo di cui attualmente siamo a conoscenza. Dal momento che questo problema nel trascriverlo è comune a tutti coloro che non possiedono strumenti specialistici, esso è noto più semplicemente come M77232917.
io capisco tutto