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- anonymous

Im on lecture 2 and cannot figure out how to separate odd numbers and prime numbers! I figured out how to generate odd numbers here http://dpaste.com/535600/ How do I get primes out of that?

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- anonymous

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- anonymous

Is there a specific interval of numbers that you want?

- anonymous

you want to put another loop in between line 6 and line 7 and it should be indented to the same level as line 6. that inner loop needs to test the number to see if it is prime

- anonymous

the new loop will be 'nested' 'inside' the 'outer' loop (the while loop)

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- anonymous

How do I test it to see if it is a prime? Do I have to divide it by a number, etc lol im lost

- anonymous

A prime number evenly divides by itself and 1 ONLY. So n/n=1 & n/1=n. Both of these have remainder of 0. If n divided by any integer between 1 and n has a remainder of 0, then n is NOT prime. Use the modulus (%) operation to find if a number has a remainder. Ex. n=15. 15%2=1 (15/2= 7 with remainder of 1). 15%3=0 (15/3= 5 with remainder of 0). So since there is at least 1 divisor (besides 1 & 15), in this case, 3, that returns 0, then 15 is not a prime.

- carlsmith

http://openstudy.com/updates/4db29a8764cb8b0b773f606e?source=email#/updates/4db692e6c08f8b0b3ee131c3
Check this question, it covers the same problem, there's a link to some working code that doesn't use imports or lists etc.. You might find what you need in there.

- carlsmith

That link doesn't seem to work, should do? Erm, just go to the list of questions and it is currently the one at the very top. The title is
grupiyati: help with p1 anyone

- carlsmith

http://pastebin.com/KU0CXFx3
There's a solution here if you wanted one.

- carlsmith

https://gist.github.com/944461
This might help.

- anonymous

def is_prime(number):
if number < 2:
return False
for each in range(2, (number+2) / 2):
if number % each == 0:
return False
return True
tally, n = 0, 0
while tally < 1000:
n += 1
if is_prime(n):
tally += 1
print n
# modified and perfected by cs

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