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 A130694 Exponents of powers of 2 that contain all ten digits. 7
 68, 70, 79, 82, 84, 87, 88, 89, 94, 95, 96, 97, 98, 100, 101, 103, 104, 105, 106, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS It is believed that every power of 2 beyond 2^86 contains the digit 0. A043537(A000079(a(n))) = 10. - Reinhard Zumkeller, Jul 29 2007 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<

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Last modified April 11 16:42 EDT 2021. Contains 342888 sequences. (Running on oeis4.)