int(str(82),7)
def dec_to_base(N, base):
if not hasattr(dec_to_base, 'table'):
dec_to_base.table = '0123456789ABCDEF'
x, y = divmod(N, base)
return dec_to_base(x, base) + dec_to_base.table[y] if x else dec_to_base.table[y]