http://math.stackexchange.com/q/882865/6876

#!/usr/bin/env python


def digit_reverse(N):
    return int(str(N)[::-1])


def test(N, n):
    """ Test if a = (N digit-reversed) fulfils n*N = a """
    return n*N == digit_reverse(N)


def search_smallest(n):
    # Obiously, it works for 0...
    N = 1
    while not test(N, n):
        N += 1
    return N

if __name__ == '__main__':
    from argparse import ArgumentParser

    parser = ArgumentParser()

    # Add more options if you like
    parser.add_argument("-n", "--multiplier", dest="n", default="9", type=int)
    args = parser.parse_args()
    print(search_smallest(args.n))