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Search: id:A156316
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| A156316 |
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Perfect squares with property that their digit reversal is a larger perfect square. |
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+0
1
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| 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
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Subsequence of A061457. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 08 2009]
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EXAMPLE
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a(1)=144 because digit reverse of 144 is 441 which is the square of 21.
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MAPLE
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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: [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 08 2009]
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CROSSREFS
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Sequence in context: A062917 A035090 A064021 this_sequence A165076 A165078 A135780
Adjacent sequences: A156313 A156314 A156315 this_sequence A156317 A156318 A156319
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KEYWORD
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nonn,base
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AUTHOR
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Gaurav Kumar (gaurav.kumar.cse06(AT)itbhu.ac.in), Feb 07 2009
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl) and Gaurav Kumar (gaurav.kumar.cse06(AT)itbhu.ac.in), Feb 08 2009
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