🔒 Some questions about the simple code

[trim pivot]

ok so I'm trying to make a function that when u enter an integer, it'll return all prime numbers under it using the eratosthene.

few questions: why prime_num = [True] * n needs to be timed with n? I'm assuming that'll mean you'll be printing as many trues in a list as the number of the input

and for the line for i in range (j*j,n,j):, why is it not possible to change the upper bound to be n+1, I'm trying to ake the function inclusive of the input, not exclusive

[glad rivet]

@trim pivot

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[trim pivot]

oh and for more context, if I use n+1, sometime's it'll be fine, sometimes it'll say
list assignment index out of range

[shadow forum]

because then you might include n in the range but n is the length of the list and the maximum index is n - 1

[polar thorn]

doing n+1 only in the for loop will get you out outside of the range of the array
you would need to do prime_num = [True] * (n + 1) as well then

[polar thorn]

it's when the last number is not a prime number and it tries to set it to False
as i said above, you also need to extend the list to begin with

[polar thorn]

!paste use this to post code in the future instead of posing it as an image

[glad rivet]

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[polar thorn]

!code if it's short like the one you had now

[glad rivet]

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[glad rivet]

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