OFFSET
1,1
COMMENTS
It is believed that every power of 2 beyond 2^86 contains the digit 0.
For k in {51,67,72,76,81,86}, 2^k contains all nonzero digits, but does not contain 0. - Dimiter Skordev, Oct 05 2021
LINKS
Seiichi Manyama, Table of n, a(n) for n = 1..10000
FORMULA
a(n) = n + 91 for n >= 78 (conjectured). - Chai Wah Wu, Jan 27 2020
EXAMPLE
2^68 = 295147905179352825856.
MATHEMATICA
A2 := {}; Do[If[Length[Union[ IntegerDigits[2^ n]]] == 10, A2 = Join[A2, {n}]], {n, 1, 200}]; Print[A2]
Select[Range[200], Min[DigitCount[2^#]]>0&] (* Harvey P. Dale, Aug 03 2019 *)
PROG
(PARI) is_A130694(n)=9<#Set(Vec(Str(1<<n))) \\ M. F. Hasler, Aug 25 2012
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Greg Dresden, Jul 10 2007
EXTENSIONS
Displayed terms double-checked by M. F. Hasler, Aug 25 2012
STATUS
approved