The prime number ends in a one. The power of two (2^74207281) from which 1 was subtracted must therefore have ended in 2. As Brent says.
So yes, JM, if you subtract 1 from this new prime number, the result will be even, as you say. But that is also true of every prime number except for 2, so is not exactly a world shattering discovery. Cheers On Fri, Jan 22, 2016 at 04:12:15PM -0500, John Mikes wrote: > *Is this to vindicate, or abrogate my negative response?* > *JM* > > On Wed, Jan 20, 2016 at 7:13 PM, Brent Meeker <[email protected]> wrote: > > > The number ends in 1 not the power of two, which must end in 2. > > > > Brent > > > > On 1/20/2016 11:49 AM, John Mikes wrote: > > > > JKC: is that so indeed? my minuscule math tells me that if something (any > > long number - or short) ends with a "1" then the* MINUS 1* of this number > > ends in a zero, dividable e.g. by 2, even 10 etc... 22 million digits??? > > John M > > > > On Wed, Jan 20, 2016 at 1:26 PM, John Clark <[email protected]> wrote: > > > >> The largest known prime number has just been found, 2^74207281 -1 is > >> prime; it starts off as 300376 carries on for a bit and then concludes with > >> 436351. I omitted the middle bit because the entire number is 22,338,618 > >> digits long. > >> > >> > >> https://www.washingtonpost.com/news/speaking-of-science/wp/2016/01/20/the-newest-prime-number-is-more-than-22-million-digits-long/ > >> > >> John K Clark > >> -- > >> You received this message because you are subscribed to the Google Groups > >> "Everything List" group. > >> To unsubscribe from this group and stop receiving emails from it, send an > >> email to [email protected]. > >> To post to this group, send email to <[email protected]> > >> [email protected]. > >> Visit this group at https://groups.google.com/group/everything-list. > >> For more options, visit https://groups.google.com/d/optout. > >> > > > > -- > > You received this message because you are subscribed to the Google Groups > > "Everything List" group. > > To unsubscribe from this group and stop receiving emails from it, send an > > email to [email protected]. > > To post to this group, send email to [email protected]. > > Visit this group at https://groups.google.com/group/everything-list. > > For more options, visit https://groups.google.com/d/optout. > > > > > > -- > > You received this message because you are subscribed to the Google Groups > > "Everything List" group. > > To unsubscribe from this group and stop receiving emails from it, send an > > email to [email protected]. > > To post to this group, send email to [email protected]. > > Visit this group at https://groups.google.com/group/everything-list. > > For more options, visit https://groups.google.com/d/optout. > > > > -- > You received this message because you are subscribed to the Google Groups > "Everything List" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at https://groups.google.com/group/everything-list. > For more options, visit https://groups.google.com/d/optout. -- ---------------------------------------------------------------------------- Dr Russell Standish Phone 0425 253119 (mobile) Principal, High Performance Coders Visiting Senior Research Fellow [email protected] Economics, Kingston University http://www.hpcoders.com.au ---------------------------------------------------------------------------- -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
