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A144833
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Lucas numbers with an equal number of odd and even digits.
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2
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18, 29, 47, 76, 1364, 271443, 710647, 12752043, 20633239, 33385282, 54018521, 2537720636, 62113250390418, 1803423556807921, 221806434537978679, 667714778405043259651218, 31368381450514812615027603
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OFFSET
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1,1
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LINKS
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EXAMPLE
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54018521 is a Lucas number with an equal number of odd and even digits.
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MATHEMATICA
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fQ[n_] := Block[{id = IntegerDigits@ n}, Length@ Select[id, OddQ@ # &] == Length@ id/2]; lst = {}; Do[ lu = LucasL@ n; If[ fQ@ lu, AppendTo[lst, lu]], {n, 300}]; lst (* Robert G. Wilson v, Sep 24 2008 *)
Select[LucasL[Range[150]], Count[IntegerDigits[#], _?OddQ] == Count[ IntegerDigits[ #], _?EvenQ]&] (* Harvey P. Dale, Dec 21 2016 *)
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CROSSREFS
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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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