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A000323
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Let A(n) = #{(i,j): i^2 + j^2 <= n}, V(n) = Pi*n, P(n) = A(n) - V(n); A000099 gives values of n where |P(n)| sets a new record; sequence gives A(A000099(n)).
(Formerly M3787 N1543)
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6
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5, 9, 21, 37, 69, 69, 89, 137, 177, 421, 481, 657, 749, 885, 1085, 1305, 1353, 1489, 1861, 2617, 2693, 3125, 5249, 5761, 7129, 8109, 9465, 9465, 10717, 12401, 12401, 16237, 16237, 24833, 30725, 35237, 46701, 47441, 47441, 61493, 67797, 67805, 67805
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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REFERENCES
| W. C. Mitchell, The number of lattice points in a k-dimensional hypersphere, Math. Comp., 20 (1966), 300-310.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
| David W. Wilson, Table of n, a(n) for n = 1..200
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CROSSREFS
| Cf. A000099, A000036, A000092, A000413, A000223.
Sequence in context: A147018 A081883 A049744 * A146131 A083943 A097074
Adjacent sequences: A000320 A000321 A000322 * A000324 A000325 A000326
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| Entry revised Jun 28 2005
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