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A008918
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4*n = (n written backwards), n > 0.
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8
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2178, 21978, 219978, 2199978, 21782178, 21999978, 217802178, 219999978, 2178002178, 2197821978, 2199999978, 21780002178, 21978021978, 21999999978, 217800002178, 217821782178, 219780021978, 219978219978, 219999999978
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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REFERENCES
| D. Wells, The Penguin Dictionary of Curious and Interesting Numbers. Penguin Books, NY, 1986.
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FORMULA
| Theorem (David W. Wilson): A008918(n) = 2*A001232(n).
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MATHEMATICA
| Flatten[Table[If[IntegerDigits[4*n] == Reverse[IntegerDigits[n]], n, {}], {n, 8, 10^7, 10}]] (* Arkadiusz Wesolowski, Sep 08 2011 *)
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CROSSREFS
| Sequence in context: A157476 A157853 A072141 * A035770 A107566 A073142
Adjacent sequences: A008915 A008916 A008917 * A008919 A008920 A008921
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KEYWORD
| nonn,base
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| Corrected and extended by David W. Wilson (davidwwilson(AT)comcast.net) Aug 15 1996, Dec 15 1997.
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