[ Challenge :] Print all pair of prime numbers whose sum equals the number given by the user !

Question

(prime number is a number bigger than unity that can be divided with another number resulting modulo 0, only by itself and by unity)

e.g. user gives 14, program prints:
3, 11
7, 7
(11, 7, 3 are all numbers that can be divided giving modulo 0 only by themselves or by unity)

Answer 1

//here is my try ... work is in progress ☺

⬜🌹🌹🌹🌹🌹⬜
🌹⬜⬜⬜⬜⬜⬜
🌹⬜⬜⬜⬜⬜⬜
🌹⬜⬜⬜🌹🌹🌹
🌹⬜⬜⬜⬜⬜🌹
🌹⬜⬜⬜⬜⬜🌹
⬜🌹🌹🌹🌹🌹⬜

https://code.sololearn.com/czTIFjtzn23y/?ref=app

Answer 2

If I understood correctly with my poor English:
https://code.sololearn.com/coGkC4vJr7sA/?ref=app

Answer 3

My try
https://code.sololearn.com/cb9W4Y88XN6t/?ref=app

Answer 4

[challenge]@all pair of prime numbers......
https://code.sololearn.com/c5FYasiEqg44/?ref=app

Answer 5

trying

Answer 6

up to any number , on C++ :

https://code.sololearn.com/cI9kjnH3AC82/#cpp

( changed after Kartik Krishnan comment. now 1 and its potential Input-1 prime number will not be counted as primes)

Answer 7

Thanks for the challenge.
Here's my try :
https://code.sololearn.com/cyCIgLghVey3/?ref=app

Answer 8

https://code.sololearn.com/cwwRFceIhiRp/?ref=app

Answer 9

https://code.sololearn.com/W3gozQC037SD/?ref=app

Answer 10

@mehmet oh yes... could you give a proof for that!

(to be honest, I am not up to date if somone could up to now. the last exciting news in this direction were about Fermat and 4-color)

Answer 11

Only up to 100... but with some brain ... have fun

https://code.sololearn.com/cf2OlIdiu56R/?ref=app

Answer 12

Here's my easy solution... :)
https://code.sololearn.com/cm8IzxBkGXSx/?ref=app

Answer 13

@Oma Falk No one has proved it for every even number, they are up to 4x10^18 though :D

Answer 14

@jonathan 2+17 =19
it it will also work with odds, if the given number is the higher one of prime twins.

Answer 15

@Kartik Krishnan
You are right! I fixed my code and changed the explanation of the challenge. Thanks for your comment.

Answer 16

TL;DR. One line is enough

https://code.sololearn.com/cFs79ze1k0IY/?ref=app

Answer 17

Check out my solution
https://code.sololearn.com/cznBct0MKF02/#

Answer 18

Have tried to increase the performance (if is that possible around Python :) )
You may compare on big numbers and give you grades (my modest first try).

also if 4 is the required sum, we still have one pair 2+2 = 4
I saw some of codes just skip this pair

https://code.sololearn.com/ctDXKEfGDH52

Answer 19

Here's my C++ approach -

#A precise one...

https://code.sololearn.com/cQyUId6T24WV/?ref=app

Answer 20

@Kacper let it run
https://code.sololearn.com/ci6OUOt9oOfV/?ref=app