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A068666 a(1) = 5; a(n) = smallest palindromic multiple of a(n-1). 10

%I

%S 5,55,5005,55055,50155105,5065665605,50155155155105,

%T 5464353998993534645,541025148469303964841520145,

%U 513016415223221833242338122322514610315

%N a(1) = 5; a(n) = smallest palindromic multiple of a(n-1).

%t 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}]

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

%K base,nonn,more

%O 1,1

%A _Amarnath Murthy_, Mar 01 2002

%E Corrected and extended by _David W. Wilson_ and _Patrick De Geest_, Mar 30 2002

%E a(10) = 513016415223221833242338122322514610315 from _John Gustaf Stebbins_, Sep 17 2008

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Last modified July 14 19:48 EDT 2020. Contains 335729 sequences. (Running on oeis4.)