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A176562 a(n) = A175341(n)/4. 3
0, 1, 2, 4, 8, 12, 18, 22, 30, 38, 48, 56, 66, 78, 96, 110, 120, 136, 154, 168, 192, 208, 232, 250, 278, 298, 320, 346, 372, 396, 426, 454, 490, 518, 556, 586, 620, 650, 688, 728, 766, 796, 840, 870, 924, 964, 1004, 1044, 1098, 1144, 1194, 1244, 1296, 1340, 1392, 1440 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Seiichi Manyama, Table of n, a(n) for n = 0..10000

FORMULA

a(n) = A305117(n^2). - Seiichi Manyama, May 26 2018

MAPLE

A175341 := proc(n) local a, x, y ; a := 0 ; for x from -n to n do for y from -n to n do if x^2+y^2 <= n^2 and gcd(x, y) = 1 then a := a+1 ; end if; end do: end do: a ; end proc: seq(A175341(n)/4, n=0..40) ; # R. J. Mathar, Apr 20 2010

CROSSREFS

Cf. A175341, A305117.

Sequence in context: A292060 A152125 A305694 * A100057 A007590 A080476

Adjacent sequences:  A176559 A176560 A176561 * A176563 A176564 A176565

KEYWORD

nonn

AUTHOR

Jaume Oliver Lafont, Apr 20 2010

EXTENSIONS

More terms from Seiichi Manyama, May 25 2018

STATUS

approved

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Last modified July 21 17:43 EDT 2019. Contains 325198 sequences. (Running on oeis4.)