Problem 5 - Twin Primes

# Function 1 - Find the primes
def findPrimes(limit):
    primes = [2, 3]
    for n in range(4, limit+1):
        isPrime = True
        for prime in primes:
            if n % prime == 0:
                isPrime = False
                break
        if isPrime:
            primes.append(n)
    print("Primes until " + str(limit) + " ----> " + str(primes))
    print()
    return primes

# FUNCTION 2 - Find the twin primes in a given primes list
def twinPrimes(limit):
    primes = findPrimes(limit)
    counter = 0
    print("***********************************************")
    for i in range(len(primes)-1):
        if primes[i+1] - primes[i] == 2:
            counter += 1
            print("Twins: " + str(primes[i]) + " and " + str(primes[i+1]))
    print("There are " + str(counter) + " pairs of twin primes from 2 to " + str(limit))
    print("***********************************************")
    print()
    return counter

# MAIN FUNCTION
limit1 = 10**3
counter1 = twinPrimes(limit1)
limit2 = 10**4
counter2 = twinPrimes(limit2)
limit3 = 10**5
counter3 = twinPrimes(limit3)
print("From 1 to " + str(limit1) + ": " + str(counter1) + " pairs of twin numbers")
print("From 1 to " + str(limit2) + ": " + str(counter2) + " pairs of twin numbers")
print("From 1 to " + str(limit3) + ": " + str(counter3) + " pairs of twin numbers")