A156316 Perfect squares with property that their digit reversal is a larger perfect square.

144, 169, 1089, 10404, 10609, 12544, 12769, 14884, 1004004, 1006009, 1022121, 1024144, 1026169, 1042441, 1044484, 1062961, 1214404, 1216609, 1236544, 1238769, 1256641, 1258884, 1444804, 1468944, 4048144, 4088484, 10036224

Offset

1,1

Comments

Subsequence of A061457. - R. J. Mathar, Feb 08 2009

Links

Harvey P. Dale, Table of n, a(n) for n = 1..399

Index entry for sequences related to reversing digits of squares

Example

a(1)=144 because the digit reverse of 144 is 441, which is the square of 21.

Maple

read("transforms") ; for n from 1 to 20000 do n2 := n^2 ; n2r := digrev(n2) ; if issqr(n2r) and n2r > n2 then printf("%d, ", n2) ; fi; od: # R. J. Mathar, Feb 08 2009

Mathematica

drlpsQ[n_]:=Module[{rev=FromDigits[Reverse[IntegerDigits[n]]]}, rev>n && IntegerQ[ Sqrt[rev]]]; Select[Range[3200]^2, drlpsQ] (* Harvey P. Dale, Jan 15 2015 *)

Crossrefs

Sequence in context: A062917 A035090 A064021 * A323614 A245214 A257412

Adjacent sequences: A156313 A156314 A156315 * A156317 A156318 A156319

Keyword

nonn,base

Author

Gaurav Kumar, Feb 07 2009

Extensions

More terms from R. J. Mathar and Gaurav Kumar, Feb 08 2009

Status

approved