A046261 Largest palindromic substring in 3^n.

1, 3, 9, 7, 8, 4, 9, 8, 656, 9, 9, 1771, 1441, 323, 969, 434, 7, 9, 9, 162261, 44, 353, 313, 414, 282, 88, 828, 484, 767, 3773, 94649, 767, 888, 5665, 6996, 999, 999, 909, 2992, 76267, 545, 717, 989, 707, 232, 55, 959, 8778, 6336, 32923, 7897987, 3693963, 989

Offset

0,2

Links

Harvey P. Dale, Table of n, a(n) for n = 0..500

Mathematica

Max/@Table[Select[FromDigits/@Flatten[Table[Partition[ IntegerDigits[ 3^k], n, 1], {n, IntegerLength[3^k]}], 1], PalindromeQ], {k, 0, 60}] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Sep 25 2018 *)

Crossrefs

Cf. A046269.

Sequence in context: A201943 A358614 A201760 * A074806 A010634 A362150

Adjacent sequences: A046258 A046259 A046260 * A046262 A046263 A046264

Keyword

nonn,base

Author

Patrick De Geest, Jun 15 1998

Status

approved