def prime():
    arr = []
    for i in range(500, 600):
        cnt = 0
        for j in range(2, int(i ** 0.5) + 1):
            if i % j == 0:
                pass
            else:
                cnt += 1
                if cnt == int(i ** 0.5) - 1:
                    arr.append(i)
    return arr
print(prime())