A322615 Nearest integer to 4*Pi*n^2.

0, 13, 50, 113, 201, 314, 452, 616, 804, 1018, 1257, 1521, 1810, 2124, 2463, 2827, 3217, 3632, 4072, 4536, 5027, 5542, 6082, 6648, 7238, 7854, 8495, 9161, 9852, 10568, 11310, 12076, 12868, 13685, 14527, 15394, 16286, 17203, 18146, 19113, 20106, 21124, 22167

Offset: 0

Author

Felix Fröhlich, Dec 20 2018

Keywords

• nonn

Comments

Surface area of a sphere of radius n, rounded to the nearest integer.

Links

• Robert Israel, Table of n, a(n) for n = 0..10000

Crossrefs

Cf. A002101, A075726, A075727.

Programs

Maple

a:=n->4*Pi*n^2: seq(round(a(n)),n=0..45); # Muniru A Asiru, Dec 20 2018

PARI

a(n) = round(4*Pi*n^2)