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A159775
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Numbers n with property that n^2 starts and ends with 81.
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1
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9, 2859, 9009, 9041, 28491, 28509, 28541, 28559, 28591, 28609, 90009, 90041, 90059, 90091, 90109, 90141, 90159, 90191, 90209, 90241, 90259, 90291, 90309, 90341, 90359, 90391, 90409, 90441, 90459, 90491, 90509, 90541, 284609, 284641, 284659
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Most first differences are alternatively 18 and 32.
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EXAMPLE
| {9,2859,9009,9041,28491}^2={81,8173881,81162081,81739681,811737081}.
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MATHEMATICA
| be9Q[n_]:=Module[{idn=IntegerDigits[n^2]}, Take[idn, 2]== Take[idn, -2] =={8, 1}]; nn=300000; Sort[Join[Select[Range[9, nn, 10], be9Q], Select[Range[ 11, nn, 10], be9Q]]] (* From Harvey P. Dale, Apr 30 2011 *)
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CROSSREFS
| A159754 Numbers n with property that n^2 ends with 81. A159254 Numbers n with property that n^2 ends with 49. A111445 n-th row contains first n numbers whose squares end in n^2.
Sequence in context: A069704 A033997 A068729 * A203744 A162013 A046896
Adjacent sequences: A159772 A159773 A159774 * A159776 A159777 A159778
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KEYWORD
| base,nonn
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AUTHOR
| Zak Seidov (zakseidov(AT)yahoo.com), Apr 21 2009
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