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Search: id:A098160
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| A098160 |
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Numbers n with property that when writing down all the natural numbers from 0 to n one uses the same number of even and odd digits. |
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+0
1
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| 1, 3, 5, 7, 9, 10, 28, 29, 30, 48, 49, 50, 68, 69, 70, 88, 89, 90
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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The sequence seems to stop at 90.
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EXAMPLE
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[0,1,2,3,4,5,6,7,8,9,10] uses 6 even digits and 6 odd digits.
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MATHEMATICA
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f[n_] := Block[{id = Mod[ Flatten[ Table[ IntegerDigits[i], {i, 0, n}]], 2]}, Length[id] - 2Plus @@ id]; Select[ Range[ 100], f[ # ] == 0 &] (from Robert G. Wilson v Nov 03 2004)
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CROSSREFS
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Sequence in context: A091177 A066929 A165249 this_sequence A103701 A122799 A107315
Adjacent sequences: A098157 A098158 A098159 this_sequence A098161 A098162 A098163
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KEYWORD
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base,easy,nonn,fini,full
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AUTHOR
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Eric Angelini (eric.angelini(AT)kntv.be), Oct 25 2004
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