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Search: id:A000690
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| A000690 |
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Landau's approximation to population of x^2 + y^2.
(Formerly M0586 N0212)
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+0
1
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| 1, 2, 3, 4, 7, 13, 24, 44, 83, 157, 297, 567, 1085, 2086, 4019, 7766, 15039, 29181, 56717, 110408, 215225, 420076, 820836, 1605587, 3143562, 6160098, 12080946
(list; graph; listen)
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OFFSET
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0,2
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
D. Shanks, The second-order term in the asymptotic expansion of B(x), Math. Comp., 18 (1964), 75-86.
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LINKS
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Index entries for sequences related to populations of quadratic forms
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CROSSREFS
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Adjacent sequences: A000687 A000688 A000689 this_sequence A000691 A000692 A000693
Sequence in context: A096723 A137495 A099779 this_sequence A049876 A049795 A014251
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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