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A036693 Number of Gaussian integers z = a + bi satisfying n-1 < |z| <= n. 1
1, 4, 8, 16, 20, 32, 32, 36, 48, 56, 64, 60, 64, 88, 84, 96, 88, 104, 108, 120, 128, 116, 144, 136, 140, 168, 160, 168, 164, 176, 192, 180, 208, 200, 216, 228, 200, 240, 220, 264, 248, 236, 264, 264, 288, 284, 264, 296, 292, 312 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

a(n)/n ~ 2*pi; a(10^2)=660, a(10^3)=6392, a(10^4)=62952, a(10^5)=628520, a(10^6)=6281404. - Reinhard Zumkeller, Jan 13 2002

LINKS

Table of n, a(n) for n=0..49.

Index entries for Gaussian integers and primes

FORMULA

a(n) = A000328(n)-A000328(n-1). - Reinhard Zumkeller, Jan 13 2002

CROSSREFS

Sequence in context: A092259 A312805 A312806 * A181471 A272753 A272804

Adjacent sequences:  A036690 A036691 A036692 * A036694 A036695 A036696

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified October 22 18:17 EDT 2019. Contains 328319 sequences. (Running on oeis4.)