Check whether given three numbers are adjacent primes in Python

Suppose we have three numbers and we have to check whether they are adjacent primes are not. The adjacent primes are prime numbers where no other prime is present between them.

So, if the input is like nums = [5,7,11], then the output will be True.

To solve this, we will follow these steps −

• if any one of these three numbers is not prime them
  • return False
• if next prime of x is not same as y, then
  • return False
• if next prime of y is not same as z, then
  • return False
• return True

Let us see the following implementation to get better understanding −

Example Code

Live Demo

def isPrime(num):
   if num > 1:
      for i in range(2, num):
         if num % i == 0:
           return False
      return True
   return False
   
def get_next_prime(num) :
   next_prime = num + 1
   while not isPrime(next_prime):
      next_prime += 1
   return next_prime
 
def solve(x, y, z) :
   if isPrime(x) == False or isPrime(y) == False or isPrime(z) == False :
      return False
 
   next_prime = get_next_prime(x)
   if next_prime != y:
      return False
 
   if get_next_prime(y) != z:
      return False
 
   return True

nums = [5,7,11]
print(solve(*nums))

Input

[5,7,11]

Output

True

Arnab Chakraborty

Updated on: 16-Jan-2021

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