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A168005
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Numbers n with property that first digit of 9*n = last digit of n.
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1
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21, 32, 43, 54, 65, 76, 87, 98, 109, 121, 131, 141, 151, 161, 171, 181, 191, 201, 211, 221, 232, 242, 252, 262, 272, 282, 292, 302, 312, 322, 332, 343, 353, 363, 373, 383, 393, 403, 413, 423, 433, 443, 454, 464, 474, 484, 494, 504, 514, 524, 534, 544, 554
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internal format)
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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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9*21=189, 9*32=288, 9*43=387, 9*54=486, etc.
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MATHEMATICA
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Reap[Do[If[IntegerDigits[n][[ -1]]==IntegerDigits[9*n][[1]], Sow[n]], {n, 1000}]][[2, 1]]
Select[Range[100], Last[IntegerDigits[#]] == First[IntegerDigits[9 #]] &] (* G. C. Greubel, Jul 03 2016 *)
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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STATUS
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approved
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