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A161902 Non-palindromic squares whose digit reversal gives a square (possibly with fewer digits). 2

%I #22 May 19 2019 13:49:07

%S 100,144,169,400,441,900,961,1089,9801,10000,10404,10609,12100,12544,

%T 12769,14400,14884,16900,40000,40401,44100,44521,48400,48841,67600,

%U 90000,90601,96100,96721,108900,980100,1000000,1004004,1006009,1020100,1022121,1024144,1026169,1040400,1042441

%N Non-palindromic squares whose digit reversal gives a square (possibly with fewer digits).

%H Vincenzo Librandi, <a href="/A161902/b161902.txt">Table of n, a(n) for n = 1..1130</a>

%t rsQ[n_]:=Module[{idn=IntegerDigits[n],ridn}, ridn=Reverse[idn]; ridn!=idn&&IntegerQ[Sqrt[FromDigits[ridn]]]]; Select[Range[2000]^2,rsQ] (* _Harvey P. Dale_, Feb 02 2011 *)

%K nonn,base

%O 1,1

%A _N. J. A. Sloane_, Jan 30 2011

%E More terms from _Harvey P. Dale_, Feb 02 2011

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Last modified April 18 22:18 EDT 2024. Contains 371782 sequences. (Running on oeis4.)