I am not able to sopt the error

we need to find the nth prime number using sieve

hello @tAkshat
ur sieve size is not big enough to find 500 000 th prime number.

first check value of 500 000 th prime number and prepare a sieve upto that and store all prime till that in ur prime array

rest is correct in ur code

i am still getting error now that i have modified the code

assuming 500000th prime to be in a range greater than 10^7 i have increased the range of p[] to 10^8

now the size of sieve is too big , u cant allocate that much memory.
value of 500 000 th prime number is 7,368,787

now prepare sieve upto this only and then try

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