A036704 a(n)=number of Gaussian integers z=a+bi satisfying |z|<=n+1/2.

1, 9, 21, 37, 69, 97, 137, 177, 225, 293, 349, 421, 489, 577, 665, 749, 861, 973, 1085, 1201, 1313, 1457, 1597, 1741, 1885, 2053, 2217, 2377, 2561, 2733, 2933, 3125, 3313, 3521, 3745, 3969, 4197, 4421, 4669, 4905, 5169, 5417

Offset: 0

Author

Clark Kimberling

Keywords

• nonn

Links

• Robert Israel, Table of n, a(n) for n = 0..10000
• Clive Tooth, A selection of a(n) values for n up to 10^9
• Index entries for Gaussian integers and primes

Crossrefs

Cf. A057655.

Formula

a(n) = A057655(n^2+n). - Robert Israel, Sep 29 2014