Irregular triangle of numbers n such that 7^n does not contain 0, 1, …, 9.

0, 1, 2, 3, 6, 7, 10, 11, 19, 35, 1, 2, 3, 7, 9, 10, 14, 21, 26, 30, 0, 1, 2, 3, 5, 6, 8, 9, 13, 15, 19, 25, 26, 28, 0, 1, 2, 4, 5, 6, 8, 10, 13, 20, 0, 1, 5, 16, 17, 20, 29, 0, 1, 2, 3, 4, 5, 6, 11, 12, 13, 14, 20, 23, 25, 0, 1, 2, 3, 4, 7, 10, 12, 19, 22, 33

1

The irregular triangle has 10 rows of different lengths.

T. D. Noe, Plot of 110 terms

T. D. Noe, Table of 110 terms

(Mma) k = 7; t = {}; Do[s = Position[Reverse[IntegerDigits[k^n]], i]; If[Length[s] == 0, AppendTo[t, n]], {i, 0, 9}, {n, 0, 1000}]; t

nonn,base,tabf

T. D. Noe, Oct 14 2014