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Search: id:A068666
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| A068666 |
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a(1) = 5; a(n) = smallest palindromic multiple of a(n-1). |
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+0
10
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| 5, 55, 5005, 55055, 50155105, 5065665605, 50155155155105, 5464353998993534645, 541025148469303964841520145, 513016415223221833242338122322514610315
(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] = 5; 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, 9}]
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CROSSREFS
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Cf. A068664, A068665, A068667, A068668, A070069, A068971, A068972, A068973, A068974.
Sequence in context: A126157 A105715 A111821 this_sequence A082780 A063855 A081785
Adjacent sequences: A068663 A068664 A068665 this_sequence A068667 A068668 A068669
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KEYWORD
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base,nonn,more
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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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Corrected and extended by David W. Wilson (davidwwilson(AT)comcast.net) and Patrick De Geest (and edited by) (pdg(AT)worldofnumbers.com), Mar 30 2002.
Added new term a(10) = 513016415223221833242338122322514610315. - John Gustaf Stebbins (jgstebbins(AT)comcast.net), Sep 17 2008
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