a(n) is the (conjectured) maximal exponent k such that n^k does not contain a digit zero in its decimal expansion.

A020665

a(n) is the (conjectured) maximal exponent k such that n^k does not contain a digit zero in its decimal expansion.

Terms

    a(0) =86a(1) =68a(2) =43a(3) =58a(4) =44a(5) =35a(6) =27a(7) =34a(8) =0a(9) =41a(10) =26a(11) =14a(12) =34a(13) =27a(14) =19a(15) =27a(16) =17a(17) =44a(18) =0a(19) =13a(20) =22a(21) =10a(22) =13a(23) =29a(24) =15a(25) =9a(26) =16a(27) =14a(28) =0a(29) =16

External references