S000291


Position of first zero digit in 7^n, counting from the right.

0, 0, 0, 0, 2, 2, 0, 0, 2, 2, 0, 0, 2, 2, 6, 5, 2, 2, 4, 0, 2, 2, 3, 7, 2, 2, 5, 7, 2, 2, 9, 6, 2, 2, 4, 0, 2, 2, 16, 9, 2, 2, 3, 17, 2, 2, 14, 26, 2, 2, 16, 27, 2, 2, 12, 15, 2, 2, 31, 5, 2, 2, 3, 9, 2, 2, 7, 9, 2, 2, 9, 22, 2, 2, 7, 8, 2, 2, 8, 9, 2, 2, 3, 12

0

S000291

Zero indicates that there are no zeros in the number. Is there a maximum value for this function? This question was discussed in MathOverflow.

T. D. Noe, Plot of 10001 terms

T. D. Noe, Table of 10001 terms

MathOverflow, Zeros in the representation of powers of 3

(Mma) Table[s = Position[Reverse[IntegerDigits[7^n]], 0]; If[Length[s] == 0, 0, s[[1, 1]]], {n, 0, 100}]

Cf. S000286-S000293.

nonn,base

T. D. Noe, Oct 12 2014

© Tony D Noe 2014-2015