A028816 - OEIS

A028816

Numbers k such that k^2 is a palindrome with an odd number of digits.

0, 1, 2, 3, 11, 22, 26, 101, 111, 121, 202, 212, 264, 307, 1001, 1111, 2002, 2285, 2636, 10001, 10101, 10201, 11011, 11111, 11211, 20002, 20102, 22865, 24846, 30693, 100001, 101101, 110011, 111111, 200002, 1000001, 1001001, 1002001, 1010101, 1011101, 1012101

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,3

LINKS

Table of n, a(n) for n=1..41.

P. De Geest, Subsets of Palindromic Squares

MATHEMATICA

id[n_]:=IntegerDigits[n]; palQ[n_]:=FromDigits[Reverse[id[n]]]==n; t={}; Do[If[palQ[x=n^2] && OddQ[Length[id[x]]], AppendTo[t, n]], {n, 1012102}]; t (* Jayanta Basu, May 13 2013 *)

CROSSREFS

Cf. A028817.

Sequence in context: A049083 A305719 A002778 * A316187 A215952 A276375

Adjacent sequences: A028813 A028814 A028815 * A028817 A028818 A028819

KEYWORD

nonn,base

AUTHOR

Patrick De Geest

STATUS

approved