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A239013
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Exponents m such that the decimal expansion of 8^m exhibits its first zero from the right later than any previous exponent.
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7
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0, 2, 3, 5, 6, 8, 9, 11, 12, 13, 17, 24, 27, 43, 144, 342, 633, 653, 2642, 6966, 16124, 84595, 225177, 4069057, 4890280, 6298187, 39573326, 99250579, 242281125, 1007075831, 4705063695, 5439666500, 5741331846, 6168193506, 9297912451, 34411164318, 36390662612, 265816303567
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OFFSET
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1,2
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COMMENTS
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Assume that a zero precedes all decimal expansions. This will take care of those cases in A030704.
Not just three times A031142; although {99250579, 6168193506, 9297912451, 34411164318, 36390662612} are possible candidates.
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LINKS
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MATHEMATICA
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f[n_] := Position[ Reverse@ Join[{0}, IntegerDigits[ PowerMod[8, n, 10^500]]], 0, 1, 1][[1, 1]]; k = mx = 0; lst = {}; While[k < 200000001, c = f[k]; If[c > mx, mx = c; AppendTo[ lst, k]; Print@ k]; k++]; lst
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CROSSREFS
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Cf. A001018, A030704, A020665, A031142, A239008, A239009, A239010, A239011, A239012, A239014, A239015.
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KEYWORD
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nonn,base
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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