Showing runtime error in testcase 1,2 and 3

#1

code:

#2

@myself.yash.srivastav hey yash you have to use prime sieve to solve this problem for reference you can see the video of sieve of erthathones in number theory section.

#3

used that only, modified code :
https://ide.codingblocks.com/s/140156

#4

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