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Search: id:A066619
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| A066619 |
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Both n and its reverse are one less than a square. |
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+0
1
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| 0, 3, 8, 99, 323, 575, 4224, 5775, 9999, 36863, 42024, 999999, 3055503, 3640463, 5597955, 8803088, 32855823, 99999999, 360696063, 422919224, 4227990528, 8250997224, 9999999999, 30485858403, 30536863503, 32154945123
(list; graph; listen)
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OFFSET
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0,2
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EXAMPLE
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4227990528 = 65023^2 - 1 and 8250997224 = 90835^2 - 1
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MATHEMATICA
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dtn[L_] := Fold[10#1+#2&, 0, L] A={}; For[i=1, i>0, i++, t=dtn[Reverse[IntegerDigits[i^2-1]]]; If[IntegerQ[(t+1)^(1/2)]&&Mod[i^2, 10]=!=1, AppendTo[A, i^2-1]; Print[A]]]
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CROSSREFS
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Adjacent sequences: A066616 A066617 A066618 this_sequence A066620 A066621 A066622
Sequence in context: A069703 A114737 A099296 this_sequence A028504 A123279 A134803
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KEYWORD
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base,nonn
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AUTHOR
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Erich Friedman (efriedma(AT)stetson.edu), Jan 08 2002
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EXTENSIONS
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More terms from Christopher Lund (clund(AT)san.rr.com), Apr 14 2002
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