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A270040
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a(n) = Smallest m >= 9 containing no fours when represented in any base from 5 through n.
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10
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10, 11, 12, 13, 15, 15, 17, 17, 66, 75, 75, 86, 86, 90, 138, 138, 138, 138, 138, 138, 138, 138, 138, 182, 182, 182, 182, 182, 182, 182, 182, 182, 185, 781817578165, 781817578165, 7826560751018861596150680
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OFFSET
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5,1
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COMMENTS
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It remains to be determined if the sequence is finite.
These numbers are not very Foury, at least not initially. (See A268236.)
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LINKS
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MATHEMATICA
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Table[SelectFirst[Range[9, 10^3], Total@ Map[Function[k, DigitCount[#, k, 4]], Range[5, n]] == 0 &], {n, 5, 60}] /. n_ /; MissingQ@ n -> Nothing (* Michael De Vlieger, Mar 10 2016, Version 10.2 *)
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CROSSREFS
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Cf. A268236, A268237, A270030, A270037, A270038, A216192, A270039, A270041, A270042, A270043, A270044, A270045.
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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