Question

program that search for prime numbers from 15 through 25.​

Answer 1

for num in range(15,25):

for i in range(2,num):

if num%i==0:

j=num/i

print("Found a factor (",i,")for",num)

Answer 2

Answer:

A positive integer greater than 1 which has no other factors except 1 and the number itself is called a prime number.

2, 3, 5, 7 etc. are prime numbers as they do not have any other factors. But 6 is not prime (it is composite) since, 2 x 3 = 6.

Source Code

   # Python program to display all the prime numbers within an interval

   lower = 900

   upper = 1000

   print("Prime numbers between", lower, "and", upper, "are:")

   for num in range(lower, upper + 1):

      # all prime numbers are greater than 1

      if num > 1:

          for i in range(2, num):

              if (num % i) == 0:

                  break

          else:

              print(num)

Run Code

Output

Prime numbers between 900 and 1000 are:

907

911

919

929

937

941

947

953

967

971

977

983

991

997

Here, we store the interval as lower for lower interval and upper for upper interval, and find prime numbers in that range. Visit this page to learn how to check whether a number is prime or not.

Explanation: