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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

Table of n, a(n) for n=1..14.

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: A045642 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 June 27 15:02 EDT 2017. Contains 288790 sequences.