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 A068667 a(1) = 7; a(n) = smallest palindromic multiple of a(n-1). 9
 7, 77, 616, 6776, 88088, 616616, 232464232, 21154245112, 232696696232, 21175399357112, 21154245133154245112, 232696696464696696232, 21175399378287399357112, 63386501441764911946714410568336 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS MATHEMATICA 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}] CROSSREFS Cf. A068664 (from a(6) on) and this sequence (from a(3) on) coincide. Cf. A068664, A068665, A068666, A068668, A070069, A068971, A068972, A068973, A068974. Sequence in context: A292737 A213261 A268958 * A261741 A228414 A043042 Adjacent sequences:  A068664 A068665 A068666 * A068668 A068669 A068670 KEYWORD base,nonn AUTHOR Amarnath Murthy, Mar 01 2002 EXTENSIONS Last two terms from David W. Wilson, Sascha Kurz and edited by Patrick De Geest, Mar 30 2002 STATUS approved

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Last modified December 16 17:02 EST 2018. Contains 318172 sequences. (Running on oeis4.)