 There are no self-descriptive numbers in bases 1, 2, 3 or 6.In bases 7 and above, there is, if nothing else, a self-descriptive number of the form formula_1, which has "b"−4 instances of the digit 0, two instances of the digit 1, one instance of the digit 2, one instance of digit "b" – 4, and no instances of any other digits.The following table lists some self-descriptive numbers in a few selected bases