A081938 a(1) = 1, a(n) = smallest palindromic number > a(n-1) of the form k*a(n-1) - 1.

1, 2, 3, 5, 9, 44, 131, 602206, 39293339293, 98576836066063867589, 727275610307618827282728816703016572727

Offset

1,2

Links

Table of n, a(n) for n=1..11.

Mathematica

nxt[n_]:=Module[{k=2}, While[!PalindromeQ[k*n-1], k++]; k*n-1]; Join[{1}, NestList[ nxt, 2, 8]] (* Harvey P. Dale, Oct 05 2018 *)

Crossrefs

Cf. A068664, A068665, A068666, A068667, A068668, A069503, A081939, A083147, A109931.

Sequence in context: A118998 A003432 A179332 * A129500 A250745 A109204

Adjacent sequences: A081935 A081936 A081937 * A081939 A081940 A081941

Keyword

base,nonn,more

Author

Amarnath Murthy, Apr 02 2003

Extensions

a(8)-a(9) from R. J. Mathar, Jul 15 2007

a(10) from Donovan Johnson, Mar 26 2011

a(11) from Max Alekseyev, Sep 14 2025

Status

approved