Doubt in prime visit

#1

my code is giving only one testcase as correct:
TESTCASE # 1 : correct (Time: 0 s)
TESTCASE # 2 : wrong-answer (Time: 0 s)
TESTCASE # 3 : timelimit (Time: 5.97 s)
please help me solve it further.

#2

Shubham, you are supposed to solve this question using prime seive optimisation. You can refer to the video lecture given in Number theory on prime seive optimisation.

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