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A066742
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Square numbers not divisible by 10 whose reverse is pentagonal.
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0
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0, 1, 529, 1089, 2116, 6241, 103041, 26222944225, 2648772525025, 6262611355441, 62443279235236, 1520130841269290490409
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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EXAMPLE
| 925 is pentagonal and 529 is square
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MATHEMATICA
| dtn[L_] := Fold[10#1+#2&, 0, L] A={0}; For[i=1, i>0, i++, t=i(3i-1)/2; r=dtn[Reverse[IntegerDigits[t]]]; If[IntegerQ[Sqrt[r]]&&Mod[t, 10]>0, AppendTo[A, r]; Print[A]]]
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CROSSREFS
| Sequence in context: A181414 A020289 A082409 * A067475 A052074 A112079
Adjacent sequences: A066739 A066740 A066741 * A066743 A066744 A066745
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KEYWORD
| base,more,nonn
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AUTHOR
| Erich Friedman (efriedma(AT)stetson.edu), Jan 16 2002
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EXTENSIONS
| Description clarified, offset corrected, and a(12) added by Lars Blomberg (lars.blomberg(AT)visit.se), May 29 2011
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