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Search: id:A068664
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| A068664 |
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a(1) = 1, a(n) = smallest palindromic multiple of a(n-1). |
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+0
10
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| 1, 2, 4, 8, 88, 616, 6776, 88088, 616616, 232464232, 21154245112, 232696696232, 21175399357112, 21154245133154245112, 232696696464696696232, 21175399378287399357112, 63386501441764911946714410568336
(list; graph; listen)
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OFFSET
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1,2
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MATHEMATICA
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a=1; Print[a]; For[n = 2, n <= 15, n++, {an = a; k = 2; str = ToString[k*an]; rstr = StringReverse[str]; While[str != rstr, {k = k + 1; str = ToString[k*an]; rstr = StringReverse[str]; If[k*an > 10^20, {Print["Too big"]; Abort[]}]}]; a := k*an; Print[k, " ", a]; }]
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CROSSREFS
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A068667 (from a(3) on) and this sequence (from a(6) on) coincide.
Cf. A068665, A068666, A068667, A068668, A070069, A068971, A068972, A068973, A068974.
Sequence in context: A088114 A076886 A046385 this_sequence A018605 A058262 A018640
Adjacent sequences: A068661 A068662 A068663 this_sequence A068665 A068666 A068667
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KEYWORD
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base,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 01 2002.
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EXTENSIONS
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Extended and edited by John W. Layman (layman(AT)math.vt.edu), Mar 18 2002. Last two terms from David W. Wilson (davidwwilson(AT)comcast.net) and Patrick De Geest (pdg(AT)worldofnumbers.com), Mar 30 2002.
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