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A000690 Landau's approximation to population of x^2 + y^2.
(Formerly M0586 N0212)
+0
1
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)
OFFSET

0,2

REFERENCES

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.

LINKS

Index entries for sequences related to populations of quadratic forms

CROSSREFS

Adjacent sequences: A000687 A000688 A000689 this_sequence A000691 A000692 A000693

Sequence in context: A096723 A137495 A099779 this_sequence A049876 A049795 A014251

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified November 8 20:39 EST 2009. Contains 166234 sequences.


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