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A007891
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A Kutz sequence.
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1
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1, 4, 1, 4, 9, 4, 9, 16, 9, 16, 25, 16, 25, 36, 25, 36, 49, 36, 49, 64, 49, 64, 81, 64, 81, 100, 81, 100, 121, 100, 121, 144, 121, 144, 169, 144, 169, 196, 169, 196, 225, 196, 225, 256, 225, 256, 289, 256, 289, 324, 289, 324, 361, 324, 361, 400, 361, 400, 441
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| R. E. Kutz, Two unusual sequences, Two-Year College Mathematics Journal, 12 (1981), 316-319.
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 1..10000
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FORMULA
| The pattern is obvious.
a(n) = (n-2*floor(n/3))^2. [Arkadiusz Wesolowski, Sep 28 2011]
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MATHEMATICA
| Table[(n - 2*Floor[n/3])^2, {n, 60}] (* Arkadiusz Wesolowski, Sep 29 2011 *)
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PROG
| (MAGMA) [(n-2*Floor(n/3))^2: n in [1..60]]; // Vincenzo Librandi, Sep 30 2011
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CROSSREFS
| Sequence in context: A079185 A133819 A021245 * A165487 A201286 A055886
Adjacent sequences: A007888 A007889 A007890 * A007892 A007893 A007894
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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