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A068666 a(1) = 5; a(n) = smallest palindromic multiple of a(n-1). 9
5, 55, 5005, 55055, 50155105, 5065665605, 50155155155105, 5464353998993534645, 541025148469303964841520145, 513016415223221833242338122322514610315 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..10.

MATHEMATICA

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}]

CROSSREFS

Cf. A068664, A068665, A068667, A068668, A070069, A068971, A068972, A068973, A068974.

Sequence in context: A105715 A111821 A275546 * A082780 A063855 A081785

Adjacent sequences:  A068663 A068664 A068665 * A068667 A068668 A068669

KEYWORD

base,nonn,more

AUTHOR

Amarnath Murthy, Mar 01 2002.

EXTENSIONS

Corrected and extended by David W. Wilson and Patrick De Geest, Mar 30 2002.

Added new term a(10) = 513016415223221833242338122322514610315. - John Gustaf Stebbins, Sep 17 2008

STATUS

approved

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Last modified March 29 18:39 EDT 2017. Contains 284273 sequences.