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  1. Prepare
  2. Mathematics
  3. Number Theory
  4. Twins
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Twins

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  • janecarter664
     + 0 comments

    Hey everyone,

    I’m in the process of applying for a university program and need to write an international business personal statement. I really want to make it unique and tailored to the global nature of the course, but I’m not sure where to start or what to focus on.

    Should I highlight travel experience, interest in global economics, or something more academic? Also, if anyone has examples or tips they’d be willing to share, that would be a huge help.

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     + 1 comment

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  • marchall0312
     + 0 comments

    Honestly resolving the challenge reminded me of the horrible getting stuck experience I had last year formatting my thesis. It is somewhat like debugging code - you fix one problem, and three additional issues pop up! I eventually found a reliable source of Thesis publishing help Toronto, and it really did save me. They were aware of all formatting words and helped make my work presentable. Just like with coding, sometimes it's okay to ask for an expert's help when overwhelmed. Anyone else?

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     + 2 comments

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  • 2k23_cscys231043
     + 0 comments
    def sieve_of_eratosthenes(max_num):
    is_prime = [True] * (max_num + 1)
    p = 2
    while (p * p <= max_num):
        if (is_prime[p] == True):
            for i in range(p * p, max_num + 1, p):
                is_prime[i] = False
        p += 1
    prime_numbers = [p for p in range(2, max_num + 1) if is_prime[p]]
    return prime_numbers

def count_twin_primes(L, R):
    primes = sieve_of_eratosthenes(R)
    primes_in_range = [p for p in primes if p >= L]
    twin_prime_count = 0
    for i in range(len(primes_in_range) - 1):
        if primes_in_range[i + 1] - primes_in_range[i] == 2:
            twin_prime_count += 1
            
    return twin_prime_count

L, R = map(int, input().split())
result = count_twin_primes(L, R)
print(result)