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A057672 a(n) equals floor(As(n) - Ac(n)), where As(n) is the area of the square with side length n and Ac(n) is the area of the circle of diameter n. 2

%I #7 Sep 05 2014 02:50:42

%S 0,0,1,3,5,7,10,13,17,21,25,30,36,42,48,54,62,69,77,85,94,103,113,123,

%T 134,145,156,168,180,193,206,219,233,248,262,278,293,309,326,343,360,

%U 378,396,415,434,454,474,494,515,536,558,580,602,625,649,672,697,721,747,772,798

%N a(n) equals floor(As(n) - Ac(n)), where As(n) is the area of the square with side length n and Ac(n) is the area of the circle of diameter n.

%F a(n) = floor(n^2*(1-Pi/4)).

%e a(7)=10 since floor(7^2(1-Pi/4)) = 10.

%o (PARI) a(n)=floor(n^2*(1-Pi/4)); \\ _Michel Marcus_, Sep 05 2014

%Y Cf. A057671.

%K nonn

%O 1,4

%A seiringer.flor(AT)eudoramail.com, Oct 18 2000

%E Edited and extended by _James A. Sellers_, Oct 20 2000

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Last modified March 18 22:50 EDT 2024. Contains 370951 sequences. (Running on oeis4.)