Largest prime number discovered: with more than 23m
digits
Known simply as M77232917, the figure is arrived at by
calculating two to the power of 77,232,917 and subtracting
one, leaving a gargantuan string of 23,249,425 digits. The
result is nearly one million digits longer than the previous
record holder discovered in January 2016. The number
belongs to a rare group of so-called Mersenne prime
numbers, named after the 17th century French monk Marin
Mersenne. Like any prime number, a Mersenne prime is
divisible only by itself and one, but is derived by multiplying
twos together over and over before taking away one. The
previous record-holding number was the 49th Mersenne
prime ever found, making the new one the 50th.
(Adaptado de Ian Sample, “Largest prime number discovered: with more than
23m digits”. The Guardian, 04/ 01/2018.)
Considerando as informações contidas no excerto anterior,
qual dos números a seguir é um primo de Mersenne?
Largest prime number discovered: with more than 23m digits
Known simply as M77232917, the figure is arrived at by calculating two to the power of 77,232,917 and subtracting one, leaving a gargantuan string of 23,249,425 digits. The result is nearly one million digits longer than the previous record holder discovered in January 2016. The number belongs to a rare group of so-called Mersenne prime numbers, named after the 17th century French monk Marin Mersenne. Like any prime number, a Mersenne prime is divisible only by itself and one, but is derived by multiplying twos together over and over before taking away one. The previous record-holding number was the 49th Mersenne prime ever found, making the new one the 50th.
(Adaptado de Ian Sample, “Largest prime number discovered: with more than 23m digits”. The Guardian, 04/ 01/2018.)
Considerando as informações contidas no excerto anterior, qual dos números a seguir é um primo de Mersenne?


We raise girls to cater to the fragile
egos of men. We teach girls do shrink
themselves, to make themselves
smaller. We tell girls ‘You can have
ambition, but not too much’. ‘You
should aim to be successful, but not too successful,
otherwise you will threaten the man’. (…) We teach girls
shame – ‘Close your legs, cover yourself!’. We make them
feel as though by being born female, they’re already guilty
of something. And so, girls grow up to be women who
cannot see they have desire. They grow up to be women
who silence themselves. They grow up to be women who
cannot say what they truly think. And they grow up – and
this is the worst thing we do to girls – to be women who
turn pretense into an art form.







