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A043525
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Numbers having one 9 in base 10.
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11
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9, 19, 29, 39, 49, 59, 69, 79, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 109, 119, 129, 139, 149, 159, 169, 179, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 209, 219, 229, 239, 249, 259, 269, 279, 289, 290, 291, 292, 293, 294, 295, 296, 297, 298, 309, 319
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graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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FORMULA
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MATHEMATICA
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Select[Range[300], DigitCount[#, 10, 9]==1&] (* Harvey P. Dale, Jan 19 2013 *)
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PROG
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(Python)
def ok(n): return str(n).count('9') == 1
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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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STATUS
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approved
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