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Search: id:A159815
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| A159815 |
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Numbers n with property that n^2 starts and ends with 49. |
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+0
1
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| 7, 707, 7007, 7043, 7057, 22143, 22157, 22193, 22207, 22243, 22257, 22293, 22307, 22343, 22357, 70007, 70043, 70057, 70093, 70107, 70143, 70157, 70193, 70207, 70243, 70257, 70293, 70307, 70343, 70357, 70393, 70407, 70443, 70457, 70493
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Most first differences are alternatively 14 and 36.
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EXAMPLE
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{7,707,7007,7043,7057,22143,22157}^2={49,499849,49098049,49603849,49801249,490312449,490932649}.
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MATHEMATICA
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s7={}; Do[If[Take[IntegerDigits[n^2], 2]=={4, 9}&&PowerMod[n, 2, 100]==49, AppendTo[s7, n]], {n, 7, 300000}]; s7
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CROSSREFS
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A159775 Numbers n with property that n^2 starts and ends with 81. 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: A144957 A163016 A129291 this_sequence A070746 A068004 A098110
Adjacent sequences: A159812 A159813 A159814 this_sequence A159816 A159817 A159818
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KEYWORD
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base,nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Apr 22 2009
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