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 <meeke...@verizon.net> 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 <johnkcl...@gmail.com> 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 everything-list+unsubscr...@googlegroups.com. > >> To post to this group, send email to <everything-list@googlegroups.com> > >> everything-list@googlegroups.com. > >> 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 everything-list+unsubscr...@googlegroups.com. > > To post to this group, send email to everything-list@googlegroups.com. > > 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 everything-list+unsubscr...@googlegroups.com. > > To post to this group, send email to everything-list@googlegroups.com. > > 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 everything-list+unsubscr...@googlegroups.com. > To post to this group, send email to everything-list@googlegroups.com. > 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 hpco...@hpcoders.com.au 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 everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
