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 A068665 a(1) = 3; a(n) = smallest palindromic multiple of a(n-1). 11
 3, 6, 66, 858, 6006, 66066, 858858, 222444222, 444888444, 21354645312, 21375999957312, 211643775577346112, 211432343445544343234112, 21354666687999978666645312, 211432554877887788778455234112, 211221333755564778877465557333122112 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Giovanni Resta, Table of n, a(n) for n = 1..19 MATHEMATICA a[1] = 3; 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, 16}] nxt[n_]:=Module[{k=2}, While[k*n!=IntegerReverse[k*n], k++]; k*n]; NestList[ nxt, 3, 15] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Sep 14 2016 *) CROSSREFS Cf. A068664, A068666, A068667, A068668, A070069, A068971, A068972, A068973, A068974, A083149. Sequence in context: A076551 A127637 A306451 * A229236 A050722 A069502 Adjacent sequences:  A068662 A068663 A068664 * A068666 A068667 A068668 KEYWORD nonn,base AUTHOR Amarnath Murthy, Mar 01 2002 EXTENSIONS More terms from David W. Wilson; edited by Patrick De Geest, Mar 30 2002 a(16) from Giovanni Resta, Sep 22 2019 STATUS approved

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Last modified September 26 08:09 EDT 2020. Contains 337346 sequences. (Running on oeis4.)