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A035123
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Roots of 'non-palindromic squares remaining square when written backwards'.
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5
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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; internal format)
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OFFSET
| 1,1
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COMMENTS
| Those with trailing zeros are excluded.
Union of ordered entries of A106323 and A106324. - Lekraj Beedassy (blekraj(AT)yahoo.com), May 02 2005
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LINKS
| P. De Geest, Palindromic Squares
Eric Weisstein's World of Mathematics, Square Number
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EXAMPLE
| E.g. 1212^2 = 1468944 -> 4498641 = 2121^2.
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MATHEMATICA
| r[n_] := FromDigits[Reverse[IntegerDigits[n]]]; Select[Range[2200], Mod[#, 10] != 0 && IntegerQ[Sqrt[r[#^2]]] && r[#^2] != #^2 &] (* Jean-François Alcover, Mar 08 2011 *)
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CROSSREFS
| Cf. A035090, A035125.
Sequence in context: A155147 A057488 A105733 * A140212 A123132 A050840
Adjacent sequences: A035120 A035121 A035122 * A035124 A035125 A035126
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KEYWORD
| nonn,base
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AUTHOR
| Patrick De Geest (pdg(AT)worldofnumbers.com), Nov 15 1998.
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