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Search: id:A060820
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| A060820 |
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a(n) = (2*n-1)^2 + (2*n)^2. |
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+0
2
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| 5, 25, 61, 113, 181, 265, 365, 481, 613, 761, 925, 1105, 1301, 1513, 1741, 1985, 2245, 2521, 2813, 3121, 3445, 3785, 4141, 4513, 4901, 5305, 5725, 6161, 6613, 7081, 7565, 8065, 8581, 9113, 9661, 10225, 10805, 11401, 12013, 12641, 13285, 13945, 14621
(list; graph; listen)
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OFFSET
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1,1
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REFERENCES
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Marilyn vos Savant and Leonore Fleischer, Brain Building in Just 12 Weeks, Bantam Books, New York, NY, 1991, pp. 104-105, 119.
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,1000
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EXAMPLE
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a(1)=5 because 1^2+2^2=5. a(2)=25 because 3^2+4^2=25.
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PROGRAM
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(PARI) { for (n=1, 1000, write("b060820.txt", n, " ", (2*n - 1)^2 + (2*n)^2); ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Jul 12 2009]
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CROSSREFS
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Sequence in context: A146412 A152734 A080856 this_sequence A146404 A054994 A108403
Adjacent sequences: A060817 A060818 A060819 this_sequence A060821 A060822 A060823
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KEYWORD
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easy,nonn
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AUTHOR
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Jason Earls (zevi_35711(AT)yahoo.com), May 05 2001
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