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Search: id:A098159
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| A098159 |
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Numbers n with property that when writing down all the natural numbers from 0 to n one uses n odd digits. |
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+0
1
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| 1, 17, 18, 20, 21, 37, 38, 40, 41, 57, 58, 60, 61, 77, 78, 80, 81, 97, 98
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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The sequences seems to stop at 98.
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EXAMPLE
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[0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17] uses 17 odd digits.
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MATHEMATICA
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f[n_] := Block[{id = Mod[ Flatten[ Table[ IntegerDigits[i], {i, 0, n}]], 2]}, Plus @@ id]; Select[ Range[ 100], f[ # ] == # &] (from Robert G. Wilson v Nov 03 2004)
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CROSSREFS
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Adjacent sequences: A098156 A098157 A098158 this_sequence A098160 A098161 A098162
Sequence in context: A043853 A043861 A043870 this_sequence A018821 A111054 A022107
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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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