import gmpy2

def gap(g, m, n):
    meme = []
    results = []
    for x in range(m,n):
        if gmpy2.is_prime(x):
            meme.append(x)

    for a in range(len(meme)):
        if meme[a] - meme[a-1] == g:
            results.append(meme[a-1])
            results.append(meme[a])
            break
    else:
        return
    return results