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Search: id:A068667
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| A068667 |
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a(1) = 7; a(n) = smallest palindromic multiple of a(n-1). |
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+0
10
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| 7, 77, 616, 6776, 88088, 616616, 232464232, 21154245112, 232696696232, 21175399357112, 21154245133154245112, 232696696464696696232, 21175399378287399357112, 63386501441764911946714410568336
(list; graph; listen)
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OFFSET
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1,1
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MATHEMATICA
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a[1] = 7; a[n_] := a[n] = Block[{k = 2}, While[k*a[n - 1] != ToExpression[ StringReverse[ ToString[k*a[n - 1]]]], k++ ]; k*a[n - 1]]; Table[a[n], {n, 1, 14}]
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CROSSREFS
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Cf. A068664 (from a(6) on) and this sequence (from a(3) on) coincide.
Cf. A068664, A068665, A068666, A068668, A070069, A068971, A068972, A068973, A068974.
Adjacent sequences: A068664 A068665 A068666 this_sequence A068668 A068669 A068670
Sequence in context: A059195 A139264 A045642 this_sequence A043042 A061546 A002281
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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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Last two terms from David W. Wilson (davidwwilson(AT)comcast.net), Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de) and Patrick De Geest (and edited by) (pdg(AT)worldofnumbers.com), Mar 30 2002.
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