OFFSET
0,2
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..1000
FORMULA
a(n) = a(n-1) + A295819(n) for n > 0.
EXAMPLE
Solutions to (x,y) = 1 and x^2 + y^2 <= 17;
* (1,4)
* * (1,3), (2,3)
* * (1,2), (3,2)
* * * * * (0,1), (1,1), (2,1), (3,1), (4,1)
* (1,0)
a(17) = 11.
MATHEMATICA
a[n_] := Sum[Boole[GCD[i, j]==1 ], {i, 0, Sqrt[n]}, {j, 0, Sqrt[n-i^2]}];
Table[a[n], {n, 0, 100}] (* Jean-François Alcover, Jul 05 2018, after Andrew Howroyd *)
PROG
(PARI) a(n) = {sum(i=0, sqrtint(n), sum(j=0, sqrtint(n-i^2), gcd(i, j) == 1))} \\ Andrew Howroyd, Dec 12 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Nov 28 2017
STATUS
approved