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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: 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.)