login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A035127 Squares which when digits are rotated left once remain square. 1

%I

%S 1,4,9,144,196,625,11664,14884,46656,96100,1493284,4112784,6385729,

%T 9253764,139287204,149377284,187799616,618268225,634284225,678758809,

%U 929884036,14938217284,43325589904,61076696769,97482577284

%N Squares which when digits are rotated left once remain square.

%C Those resulting in leading zeros are excluded.

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/SquareNumber.html">Square Number</a>

%e 2527^2 = 6385729 -> 3857296 = 1964^2.

%t okQ[n_]:=Module[{idn=IntegerDigits[n]},idn[[2]]!=0&&IntegerQ[Sqrt[ FromDigits[RotateLeft[idn]]]]]; Join[{1,4,9},Select[Range[4,320000]^2, okQ]] (* _Harvey P. Dale_, Apr 30 2011 *)

%Y Cf. A045878, A035131.

%K nonn,base

%O 1,2

%A _Patrick De Geest_, Nov 15 1998

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 28 21:37 EDT 2020. Contains 334690 sequences. (Running on oeis4.)