(ii) 19 is a prime number, And as 7, the number 19 is a prime number and has only two factors, 1 and 19. For example: (i) 7 is a prime number, As it has only two factors, that is, 1 and 7. A natural number greater than 1 that is not a prime number is called a composite number. Frequently Asked Questions What are Prime Numbers The numbers having only two factors, that is, 1 and the number itself are called prime numbers. In mathematics, a prime number is a natural number greater than 1 with no positive divisors other than 1. Now what is happening is, for every instance of a prime number x (the prime number) is being added (appended) to the list primeNums. Copy and Paste or Download a list of the prime numbers in many popular formats such as Excel, PDF, CSV, or Plain Text. Again, using the if statement from before: #defining the list To create a list of prime numbers, you must first define a list, and then add the prime numbers to that list. What this does now, is for every instance of a prime number, you will add 1 to the count of prime numbers. Thus what is happening, when you use 100 as your num your function will return 1060, as this is the sum of all the primes up to 100.įirst, if you want to know the total amount of prime numbers up to a certain number, you can use the following: #define a variable to track the total number of primes The problem lies within this: if sympy.isprime(x) = True:Ībove, when you are doing primes = primes + x what you are saying is that you want to add the value of the x (a prime number) to the variable primes.
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