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A109929
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Least palindromic multiple of concatenation n,n-1,n-2,...3,2,1.
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1
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1, 252, 180081, 855558, 335323533, 1072288822701, 1338059508331, 770589909985077, 97777777779, 98888888889, 1109887655445567889011, 739760991261414162199067937, 33436553118011488411081135563433, 4447899705293460330643925079987444, 551190490170920715517029071094091155
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OFFSET
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1,2
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COMMENTS
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a(12) > 10^25. - Donovan Johnson, Mar 28 2011
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LINKS
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Table of n, a(n) for n=1..15.
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MATHEMATICA
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f[n_] := Block[{k = 1, p = FromDigits[ Flatten[ IntegerDigits /@ Range[n, 1, -1]]]}, While[k p != FromDigits[ Reverse[ IntegerDigits[k p]]], k++ ]; k p]; Table[ f[n], {n, 11}] (* Robert G. Wilson v *)
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CROSSREFS
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Cf. A109924.
Sequence in context: A248165 A289567 A179714 * A295441 A203062 A259452
Adjacent sequences: A109926 A109927 A109928 * A109930 A109931 A109932
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KEYWORD
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base,nonn
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AUTHOR
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Amarnath Murthy, Jul 18 2005
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EXTENSIONS
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Edited, corrected and extended (a(3) - a(10)) by Robert G. Wilson v, Jul 21 2005
a(11) from Donovan Johnson, Mar 28 2011
a(12)-a(15) from Giovanni Resta, Sep 23 2019
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STATUS
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approved
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