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A109929
Least palindromic multiple of concatenation n,n-1,n-2,...3,2,1.
1
1, 252, 180081, 855558, 335323533, 1072288822701, 1338059508331, 770589909985077, 97777777779, 98888888889, 1109887655445567889011, 739760991261414162199067937, 33436553118011488411081135563433, 4447899705293460330643925079987444, 551190490170920715517029071094091155
OFFSET
1,2
COMMENTS
a(12) > 10^25. - Donovan Johnson, Mar 28 2011
MATHEMATICA
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 *)
CROSSREFS
Cf. A109924.
Sequence in context: A248165 A289567 A179714 * A351484 A295441 A362170
KEYWORD
base,nonn
AUTHOR
Amarnath Murthy, Jul 18 2005
EXTENSIONS
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
STATUS
approved