lower = int(input(“Give lower limit: “)) # Get lower bound, must be an int upper = int(input(“Give upper limit: “)) # Get upper bound, must be an int print() # Print an empty line primes = [] # An array to store the primes in for i in range(lower, upper+1): # Go through the range … Read more
The sqrt() method may help. Here is an idea of how to use it: int squareRoot = (int) Math.sqrt((double) input); Input being the number you want to round. Casting the result to an int will automatically round it. It is optional. I cast the input to a double, but you only need to do so … Read more
You need to set isPrime to 0 each time the user enters a number. Otherwise, it still holds the value from the previous number. Move the variable declaration int isPrime = 0; inside the while loop. BTW, isn’t that variable name backwards? You set it to 1 (i.e. true) when you discover that there’s a … Read more
This can be a start. This checks whether the number N is divisible by all numbers from 2 to int(sqrt(N)) + 1, where the int function truncates the square root of N. The all() function in python returns True if all members of a list satisfy some condition (here not zero). You should set an … Read more
Your problem is that you never eliminate the last number in numbers. If range_number is 21, then len(numbers) is 20 and len(numbers)-1 is 19. So this line here: for n in range(i + numbers[i], len(numbers)-1, numbers[i]): Never actually removes the number 20 from the list. You could have seen this if you’d printed out the … Read more
The number whose factor you are trying to find is out of the range of values that long can hold.Here you can see maximum size of values that data type in c can store.Also, I would recommend using long long at all places where the number to be stored is derived from the num i.e. … Read more
Let p1, p2, p3, … pk be the prime factors of some positive integer n. By the fundamental theorem of arithmetic, n can be represented as p1e1•p2e2•p3e3• … pkek for some positive integers e1, e2, e3, … ek. Furthermore, any such set of such positive integers represents one positive integer in this way. Every factor … Read more