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Search: id:A066528
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| A066528 |
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Non-palindromic triangular numbers whose reverse is also triangular. |
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+0
1
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| 153, 351, 17578, 87571, 185745, 547581, 1461195, 5911641, 12145056, 12517506, 60571521, 65054121, 304119453, 354911403, 1775275491, 1945725771, 10246462281, 17990863516, 18226464201, 35615002605, 50620051653
(list; graph; listen)
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OFFSET
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0,1
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EXAMPLE
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153 and 351 are both triangular
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MATHEMATICA
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dtn[L_] := Fold[10#1+#2&, 0, L] tritest[n_] := Module[{t}, t=Floor[N[Sqrt[2n]]]; 2n==t(t+1)] A={}; For[i=1, i>0, i++, t=i(i+1)/2; If[tritest[tt=dtn[Reverse[IntegerDigits[t]]]]&&Mod[t, 10]>0&&t=!=tt, AppendTo[A, t]; Print[A]]]
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CROSSREFS
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Sequence in context: A165340 A104810 A159294 this_sequence A046197 A056733 A050209
Adjacent sequences: A066525 A066526 A066527 this_sequence A066529 A066530 A066531
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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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