Question

is 89723356253 a prime number?

Answer 1

71 is a factor of it

Answer 2

did you get that analytically mathslover? because I cannot...

Answer 3

sorry forgot to mention source : http://www.wolframalpha.com/input/?i=89723356253%20prime%20number&t=crmtb01

Answer 4

yeah that's the way I did it too, but it's not very satisfying...

Answer 5

but i can say it wait ( analytical reason )

Answer 6

first of all find the square root of the given number 89723356253

Answer 7

you mean with that crazy algorithm or a how...?

Answer 8

wait lemme upload it

Answer 9

just wait for 1 minute please

Answer 10

it is taking time sorry

Answer 11

Hmn i meant LIKE THIS :

Answer 12

@TuringTest what do you think that why not to have a look right here?:
http://www.wikihow.com/Check-if-a-Number-Is-Prime

Answer 13

I figured you could use Fermat's little theorem, but I'm no good at that really so I kind of wanted to see it done
it's okay though, I should learn it myself

Answer 14

we can skip each even number and then skip each multiple of 3 between 2 and 299538

5 , 7 , 11 , 13 , 17 , 19 , 23 , 29 , 31 , 37 , 39 , 41 , 43 , 47 , 51 , 53 , 59 , 61 , 67 , 71 and soon

5 is not possible

7 ---> checking it : no ..

11 --> no ..

13 , 17 , 19 ... 67 no

71 yes!! :D

Answer 15

wait for 5 minutes i will do all divisions and show u ..

Answer 16

trial-and-error was not what I was hoping for, but still, thanks

Answer 17

should i do that calculations?

Answer 18

nah, it's okay, unless @monik wants to see them :)

Answer 19

like this :) I dont have much staminah at 11 PM right now

sorry @TuringTest and @monik I promise i will do that tomorrow with a better and easier way ..

sorry :(

and thanks!!!

Answer 20

Thanks @mathslover ! Although I came across fermats little theorem but not quite sure on how to apply it.

Answer 21

"Fermats little theorem" .. I will have a look on to it today .. and post something tricky ( example ) about it
@monik

Answer 22

by the way : \(\Huge{\mathbb{Welcome}\textbf{To}\mathbb{Open}\textbf{Study}}\)