a(n) is the least value of k such that the decimal expansion of n^k contains nine consecutive identical digits.

A217164

a(n) is the least value of k such that the decimal expansion of n^k contains nine consecutive identical digits.

Terms

    a(0) =42485a(1) =22791a(2) =21243a(3) =2796a(4) =27717a(5) =33836a(6) =14162a(7) =22076a(8) =9a(9) =9443a(10) =11429a(11) =16661a(12) =16548a(13) =11259a(14) =10622a(15) =14991a(16) =5786a(17) =28096a(18) =9a(19) =2890a(20) =16736a(21) =14116a(22) =4549a(23) =1398a(24) =27735a(25) =7597a(26) =3614a(27) =10332a(28) =9a(29) =4057

External references