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A035123 Roots of 'non-palindromic squares remaining square when written backwards'. 5
12, 13, 21, 31, 33, 99, 102, 103, 112, 113, 122, 201, 211, 221, 301, 311, 1002, 1003, 1011, 1012, 1013, 1021, 1022, 1031, 1101, 1102, 1103, 1112, 1113, 1121, 1122, 1201, 1202, 1211, 1212, 1301, 2001, 2011, 2012, 2021, 2022, 2101, 2102, 2111, 2121 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Those with trailing zeros are excluded.

Union of ordered entries of A106323 and A106324. - Lekraj Beedassy, May 02 2005

LINKS

Table of n, a(n) for n=1..45.

P. De Geest, Palindromic Squares

Eric Weisstein's World of Mathematics, Square Number

EXAMPLE

E.g. 1212^2 = 1468944 -> 4498641 = 2121^2.

MATHEMATICA

r[n_] := FromDigits[Reverse[IntegerDigits[n]]]; Select[Range[2200], Mod[#, 10] != 0 && IntegerQ[Sqrt[r[#^2]]] && r[#^2] != #^2 &] (* Jean-Fran├žois Alcover, Mar 08 2011 *)

CROSSREFS

Cf. A035090, A035125.

Sequence in context: A225102 A057488 A105733 * A140212 A123132 A050840

Adjacent sequences:  A035120 A035121 A035122 * A035124 A035125 A035126

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, Nov 15 1998.

STATUS

approved

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Last modified September 25 16:25 EDT 2017. Contains 292499 sequences.