a python version ..

gistfile1.py

import random

def check(n):
    for x in range(7):
        for y in range(x + 1, 7):
            if (int(n / 49 ** x % 49) == int(n / 49 ** y % 49)):
                return False
    return True

while True:
    n = random.randint(0, 49 ** 7 - 1)
    if (check(n)):
        break

for x in range(7):
    print n % 49 + 1
    n = int(n / 49)